| Class Number |
Class Name |
No. of Patents |
| 420/400 |
Alkali metal base |
25 |
| 420/415 |
Alkaline earth metal base |
15 |
| 420/528 |
Aluminum base |
219 |
| 420/554 |
Cadmium, lead, or bismuth containing |
39 |
| 420/529 |
Copper containing |
86 |
| 420/538 |
Iron, cobalt, or nickel containing |
89 |
| 420/533 |
Magnesium containing |
118 |
| 420/534 |
Silicon containing |
138 |
| 420/536 |
Cadmium, lead or bismuth containing |
13 |
| 420/535 |
Titanium, zirconium, hafnium, vanadium, niobium, or tantalum containing |
147 |
| 420/537 |
Silicon containing |
107 |
| 420/539 |
Silver containing |
22 |
| 420/530 |
Tin containing |
49 |
| 420/531 |
Zinc containing |
32 |
| 420/532 |
Magnesium containing |
133 |
| 420/550 |
Iron, cobalt, or nickel containing |
121 |
| 420/551 |
Titanium, zirconium, hafnium, vanadium, noobium or tantalum containing |
99 |
| 420/542 |
Magnesium containing |
105 |
| 420/547 |
Iron, cobalt, or nickel containing |
55 |
| 420/546 |
Silicon containing |
91 |
| 420/543 |
Titanium, zirconium, hafnium, vanadium, niobium, or tantalum containing |
83 |
| 420/545 |
Chromium containing |
32 |
| 420/544 |
Silicon containing |
69 |
| 420/548 |
Silicon containing |
161 |
| 420/549 |
Alkali, or alkaline earth metal containing |
58 |
| 420/552 |
Titanium, zirconium, hafnium, vanadium, niobium, or tantalum containing |
133 |
| 420/553 |
Manganese containing |
90 |
| 420/540 |
Zinc containing |
54 |
| 420/541 |
Magnesium containing |
67 |
| 420/576 |
Antimony base |
29 |
| 420/579 |
Arsenic base or selenium or tellurium base alloy containing metal |
51 |
| 420/401 |
Beryllium base |
20 |
| 420/577 |
Bismuth base |
32 |
| 420/525 |
Cadmium base |
17 |
| 420/428 |
Chromium base |
93 |
| 420/435 |
Cobalt base |
212 |
| 420/436 |
Chromium containing |
116 |
| 420/437 |
Aluminum containing |
55 |
| 420/438 |
Titanium containing |
30 |
| 420/440 |
Iron containing |
74 |
| 420/439 |
Titanium containing |
37 |
| 420/580 |
Containing over 50 per cent metal but no base metal |
249 |
| 420/588 |
Chromium containing |
182 |
| 420/587 |
Copper containing |
150 |
| 420/581 |
Iron containing |
187 |
| 420/583 |
Chromium containing |
81 |
| 420/584.1 |
Nickel containing |
148 |
| 420/585 |
Cobalt containing |
91 |
| 420/586 |
Titanium, or zirconium containing |
117 |
| 420/586.1 |
Molybdenum containing |
128 |
| 420/582 |
Copper containing |
118 |
| 420/589 |
Tin containing |
78 |
| 420/469 |
Copper base |
87 |
| 420/489 |
Aluminum, gallium, indium, or thallium containing |
61 |
| 420/494 |
Beryllium, magnesium, or alkaline earth metal containing |
44 |
| 420/498 |
Cadmium, or mercury containing |
6 |
| 420/496 |
Iron or cobalt containing |
45 |
| 420/491 |
Lead containing |
22 |
| 420/493 |
Manganese containing |
23 |
| 420/485 |
Nickel containing |
78 |
| 420/486 |
Aluminum containing |
45 |
| 420/487 |
Iron or manganese containing |
62 |
| 420/488 |
Refractory metal containing |
38 |
| 420/497 |
Noble metal containing |
43 |
| 420/495 |
Other refractory metal containing |
48 |
| 420/499 |
Phosphorus, arsenic, antimony, or bismuth containing |
50 |
| 420/490 |
Silicon containing |
42 |
| 420/500 |
Sulfur, selenium, or tellurium containing |
33 |
| 420/470 |
Tin containing |
56 |
| 420/471 |
Aluminum containing |
32 |
| 420/473 |
Iron, manganese or nickel containing |
94 |
| 420/474 |
Lead containing |
22 |
| 420/475 |
Zinc containing |
21 |
| 420/472 |
Phosphorus containing |
65 |
| 420/476 |
Zinc containing |
42 |
| 420/492 |
Titanium, zirconium or hafnium containing |
76 |
| 420/477 |
Zinc containing |
60 |
| 420/478 |
Aluminum containing |
36 |
| 420/480 |
Manganese containing |
30 |
| 420/479 |
Nickel containing |
40 |
| 420/482 |
Manganese containing |
20 |
| 420/481 |
Nickel containing |
47 |
| 420/483 |
Noble metal containing |
12 |
| 420/484 |
Refractory metal containing |
14 |
| 420/8 |
Ferrous (i.e., iron base) |
91 |
| 420/120 |
1.5 percent or more manganese containing, but less than 8 percent |
50 |
| 420/9 |
1.7 percent or more carbon containing |
34 |
| 420/13 |
2.7 percent or more carbon equivalent containing (i.e., cast iron) |
36 |
| 420/14 |
Boron containing |
14 |
| 420/15 |
Chromium containing |
31 |
| 420/16 |
Nickel containing |
18 |
| 420/17 |
Molybdenum containing |
22 |
| 420/26 |
Copper containing |
17 |
| 420/27 |
Nickel or molybdenum containing |
28 |
| 420/28 |
Over .1 percent aluminum containing |
12 |
| 420/18 |
Processes of adding magnesium |
19 |
| 420/19 |
Adding magnesium as a liquid, vapor or as a solid agent entrained by gas (e.g., fluidized) |
17 |
| 420/20 |
Flowing molten iron alloy onto solid magnesium containing agent, or adding solid magnesium containing agent to molten stream of iron alloy |
30 |
| 420/25 |
In agent also containing silicon, rare earth, or alkaline earth metal |
22 |
| 420/23 |
Magnesium containing agent is coated, impregnated, or compacted (e.g., briquetted, coated particles) |
27 |
| 420/24 |
Magnesium present in agent only as a compound with a nonmetal |
3 |
| 420/21 |
Mechanically plunging magnesium containing agent below surface of iron alloy melt |
18 |
| 420/22 |
Separate addition of plural agents, at least one containing magnesium |
18 |
| 420/29 |
Processes |
28 |
| 420/30 |
Adding rare earth or alkaline earth metal |
32 |
| 420/33 |
Adding silicon |
25 |
| 420/31 |
Adding sulfur, selenium or tellurium |
9 |
| 420/32 |
Adding vanadium, titanium, niobium, or zirconium |
8 |
| 420/10 |
Six percent or more total group iv, v or vi transition metals containing |
33 |
| 420/11 |
Eight percent or more chromium containing |
16 |
| 420/12 |
Molybdenum, tungsten or vanadium containing |
43 |
| 420/121 |
Boron containing |
246 |
| 420/104 |
Chromium containing, but less than 9 percent |
129 |
| 420/105 |
Molybdenum containing |
72 |
| 420/106 |
Boron or beryllium containing |
53 |
| 420/107 |
Cobalt containing |
40 |
| 420/108 |
Nickel containing |
62 |
| 420/109 |
Vanadium, titanium or zirconium containing |
110 |
| 420/110 |
Titanium, zirconium or niobium containing |
73 |
| 420/111 |
Vanadium containing |
72 |
| 420/112 |
Nickel containing |
62 |
| 420/113 |
Tungsten containing |
12 |
| 420/115 |
Processes |
9 |
| 420/116 |
Including reducing a chromium compound |
5 |
| 420/114 |
Tungsten containing |
24 |
| 420/89 |
Copper containing |
46 |
| 420/90 |
Chromium containing |
31 |
| 420/91 |
Nickel containing |
47 |
| 420/92 |
Nickel containing |
40 |
| 420/93 |
Vanadium, zirconium, titanium or molybdenum containing |
21 |
| 420/72 |
Eight percent or more manganese containing |
31 |
| 420/74 |
Chromium containing |
42 |
| 420/76 |
Copper containing |
6 |
| 420/73 |
Nickel containing |
40 |
| 420/75 |
Titanium containing |
19 |
| 420/77 |
Four percent or more aluminum containing |
37 |
| 420/79 |
Chromium containing |
46 |
| 420/80 |
Nickel or cobalt containing |
22 |
| 420/78 |
Over 2 percent silicon containing |
21 |
| 420/81 |
Zirconium, vanadium or titanium containing |
23 |
| 420/84 |
Lead, bismuth, selenium, tellurium or calcium containing |
99 |
| 420/85 |
Processes |
24 |
| 420/86 |
Adding lead |
13 |
| 420/123 |
Molybdneum containing |
41 |
| 420/124 |
Vanadium, tantalum or titanium containing |
27 |
| 420/119 |
Nickel containing, but 10 percent or less |
79 |
| 420/34 |
Nine percent or more chromium containing |
103 |
| 420/65 |
0.25 percent or more nitrogen containing |
28 |
| 420/66 |
Group iv or v transition metal containing |
15 |
| 420/64 |
Boron containing |
51 |
| 420/36 |
Cobalt containing |
40 |
| 420/37 |
Molybdenum or tungsten containing |
36 |
| 420/39 |
Copper containing |
12 |
| 420/38 |
Nickel containing |
64 |
| 420/60 |
Copper containing |
52 |
| 420/61 |
Molybdenum or tungsten containing |
64 |
| 420/43 |
Eight percent or more nickel containing |
83 |
| 420/49 |
Copper containing |
55 |
| 420/54 |
Group iv or v transition metal containing |
48 |
| 420/52 |
Molybdenum containing |
69 |
| 420/53 |
Group iv or v transition metal containing |
65 |
| 420/55 |
Over 0.1 percent carbon containing |
18 |
| 420/50 |
Over 1.5 percent silicon containing |
62 |
| 420/51 |
Group iv or v transition metal containing |
30 |
| 420/44 |
Over 2 percent manganese containing |
33 |
| 420/45 |
Copper containing |
24 |
| 420/48 |
Group iv or v transition metal containing |
23 |
| 420/46 |
Molybdenum or tungsten containing |
41 |
| 420/47 |
Group iv or v transition metal containing |
37 |
| 420/56 |
Eight percent or more total nickel plus manganese containing |
65 |
| 420/58 |
Copper containing |
33 |
| 420/57 |
Molybdenum or tungsten containing |
75 |
| 420/59 |
Over 0.20 percent nitrogen containing |
49 |
| 420/70 |
Group iv or v transition metal containing |
73 |
| 420/41 |
Lead, bismuth, antimony, calcium, selenium or tellurium containing |
69 |
| 420/67 |
Molybdenum or tungsten containing |
88 |
| 420/68 |
Titanium, zirconium or hafnium containing |
60 |
| 420/69 |
Vanadium, niobium or tantalum containing |
102 |
| 420/35 |
Noble metal containing |
22 |
| 420/42 |
Over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability |
73 |
| 420/62 |
Over 0.1 percent aluminum containing |
56 |
| 420/63 |
Molybdenum or tungsten conaining |
35 |
| 420/71 |
Processes |
33 |
| 420/40 |
Rare earth containing |
110 |
| 420/128 |
Nitrogen containinig |
76 |
| 420/82 |
Noble metal containing |
19 |
| 420/99 |
One percent or more carbon containing, but less than 1.7 percent |
28 |
| 420/100 |
Chromium containing |
29 |
| 420/101 |
Molybdenum containing |
32 |
| 420/102 |
Cobalt containing |
17 |
| 420/87 |
Over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability |
95 |
| 420/88 |
Processes of making or treating alloy containing over 0.04 percent phosphorus |
15 |
| 420/103 |
Over 0.1 percent aluminum containing, but less than 4 percent |
73 |
| 420/94 |
Over 10 percent nickel containing |
73 |
| 420/97 |
Chromium containing |
56 |
| 420/95 |
Cobalt containing |
68 |
| 420/96 |
Molybdenum containing |
46 |
| 420/98 |
Over 1 percent silicon containing |
19 |
| 420/129 |
Processes |
118 |
| 420/83 |
Rare earth metal containing |
264 |
| 420/126 |
Titanium containing |
79 |
| 420/122 |
Tungsten containing |
29 |
| 420/117 |
Two percent or more silicon containing |
120 |
| 420/118 |
Titanium, molybdenum, tungsten or vanadium containing |
22 |
| 420/127 |
Vanadium, tantalum or niobium containing |
98 |
| 420/125 |
Zirconium containing |
33 |
| 420/555 |
Gallium, indium, or thallium base |
67 |
| 420/556 |
Germanium base |
19 |
| 420/507 |
Gold base |
78 |
| 420/512 |
Iron, cobalt, or nickel containing |
36 |
| 420/508 |
Palladium containing |
57 |
| 420/509 |
Platinum containing |
27 |
| 420/510 |
Platinum containing |
25 |
| 420/511 |
Silver containing |
39 |
| 420/900 |
Hydrogen storage |
431 |
| 420/563 |
Lead base |
28 |
| 420/564 |
Alkali, alkaline earth metal or magnesium containing |
17 |
| 420/565 |
Tin containing |
17 |
| 420/572 |
Antimony containing |
17 |
| 420/567 |
Arsenic containing |
4 |
| 420/568 |
Tin containing |
3 |
| 420/569 |
Antimony containing |
13 |
| 420/575 |
Cadmium containing |
1 |
| 420/573 |
Copper containing |
14 |
| 420/566 |
Silver containing |
32 |
| 420/570 |
Tin containing |
42 |
| 420/571 |
Antimony containing |
22 |
| 420/574 |
Zinc containing |
2 |
| 420/402 |
Magnesium base |
65 |
| 420/407 |
Aluminum containing |
55 |
| 420/410 |
Manganese containing |
23 |
| 420/408 |
Zinc containing |
31 |
| 420/409 |
Manganese containing |
36 |
| 420/405 |
Lanthanide containing |
35 |
| 420/406 |
Zirconium containing |
15 |
| 420/413 |
Manganese containing |
12 |
| 420/403 |
Silver containing |
12 |
| 420/404 |
Manganese containing |
1 |
| 420/411 |
Zinc containing |
30 |
| 420/412 |
Manganese containing |
14 |
| 420/414 |
Zirconium containing |
7 |
| 420/434 |
Manganese base |
58 |
| 420/526 |
Mercury base |
30 |
| 420/527 |
Silver containing |
29 |
| 420/591 |
Miscellaneous |
8 |
| 420/429 |
Molybdenum base |
81 |
| 420/441 |
Nickel base |
142 |
| 420/460 |
Aluminum containing |
89 |
| 420/442 |
Chromium containing |
111 |
| 420/445 |
Aluminum containing |
165 |
| 420/446 |
Titanium containing |
57 |
| 420/450 |
Molybdenum or tungsten containing |
58 |
| 420/447 |
Tantalum, niobium, vanadium, or hafnium containing |
73 |
| 420/448 |
Molybdenum or tungsten containing |
215 |
| 420/449 |
Zirconium or boron containing |
80 |
| 420/452 |
Iron or manganese containing |
85 |
| 420/453 |
Molybdenum or tungsten containing |
93 |
| 420/454 |
Cobalt containing |
52 |
| 420/444 |
Noble metal containing |
37 |
| 420/443 |
Rare earth, magnesium or alkaline earth metal containing |
187 |
| 420/451 |
Titanium containing |
69 |
| 420/457 |
Copper containing |
44 |
| 420/458 |
Iron containing |
24 |
| 420/459 |
Iron or manganese containing |
107 |
| 420/456 |
Noble metal containing |
32 |
| 420/455 |
Rare earth containing |
97 |
| 420/425 |
Niobium base |
65 |
| 420/426 |
Titanium, zirconium, or hafnium containing |
51 |
| 420/461 |
Osmium or iridium base |
28 |
| 420/463 |
Palladium base |
88 |
| 420/464 |
Copper containing |
36 |
| 420/465 |
Platinum containing |
14 |
| 420/466 |
Platinum base |
65 |
| 420/468 |
Nickel containing |
14 |
| 420/467 |
Rhodium containing |
16 |
| 420/590 |
Processes |
388 |
| 420/1 |
Radioactive |
17 |
| 420/2 |
Actinide base; singly or in combination |
10 |
| 420/3 |
Uranium base |
25 |
| 420/7 |
Aluminum base |
5 |
| 420/4 |
Iron base |
4 |
| 420/5 |
Magnesium base |
2 |
| 420/6 |
Nickel or cobalt base |
3 |
| 420/416 |
Rare earth metal base singly or in combination |
97 |
| 420/433 |
Rhenium base |
24 |
| 420/462 |
Ruthenium or rhodium base |
33 |
| 420/903 |
Semiconductive |
38 |
| 420/578 |
Silicon base alloy containing metal |
87 |
| 420/501 |
Silver base |
77 |
| 420/502 |
Copper containing |
76 |
| 420/503 |
Other noble metal containing |
38 |
| 420/504 |
Zinc, or cadmium containing |
37 |
| 420/505 |
Other noble metal containing |
32 |
| 420/506 |
Zinc, or cadmium containing |
16 |
| 420/901 |
Superconductive |
73 |
| 420/902 |
Superplastic |
80 |
| 420/427 |
Tantalum base |
76 |
| 420/557 |
Tin base |
93 |
| 420/562 |
Antimony, or bismuth containing |
92 |
| 420/560 |
Copper containing |
81 |
| 420/561 |
Antimony, or bismuth containing |
74 |
| 420/558 |
Lead containing |
26 |
| 420/559 |
Antimony, or bismuth containing |
34 |
| 420/417 |
Titanium base |
202 |
| 420/418 |
Aluminum containing |
174 |
| 420/419 |
Tin containing |
39 |
| 420/420 |
Vanadium containing |
87 |
| 420/421 |
Chromium or molybdenum containing |
145 |
| 420/430 |
Tungsten base |
64 |
| 420/431 |
Carbon, boron or nitrogen containing |
26 |
| 420/432 |
Rhenium or noble metal containing |
18 |
| 420/424 |
Vanadium base |
40 |
| 420/513 |
Zinc base |
49 |
| 420/514 |
Aluminum containing |
40 |
| 420/515 |
Copper containing |
15 |
| 420/518 |
Manganese, iron, cobalt, or nickel containing |
10 |
| 420/516 |
Mangesium containing |
17 |
| 420/517 |
Tin containing |
4 |
| 420/519 |
Magnesium containing |
19 |
| 420/520 |
Manganese, iron, cobalt, or nickel containing |
14 |
| 420/523 |
Cadmium containing |
9 |
| 420/521 |
Copper containing |
6 |
| 420/522 |
Manganese, iron, cobalt, or nickel containing |
1 |
| 420/524 |
Tin containing |
11 |
| 420/422 |
Zirconium or hafnium base |
184 |
| 420/423 |
Copper containing |
27 |
