| Class Number |
Class Name |
No. of Patents |
| 507/933 |
Acidizing or formation destroying |
177 |
| 507/934 |
With inhibitor |
98 |
| 507/920 |
Biocidal |
32 |
| 507/925 |
Completion or workover fluid |
222 |
| 507/902 |
Controlled release agent |
109 |
| 507/939 |
Corrosion inhibitor |
233 |
| 507/903 |
Crosslinked resin or polymer |
291 |
| 507/910 |
Earth boring fluid devoid of discrete aqueous phase |
42 |
| 507/100 |
Earth boring |
42 |
| 507/101 |
Contains enzyme or living microorganism |
14 |
| 507/140 |
Contains inorganic component other than water or clay |
229 |
| 507/142 |
Inorganic component contains phosphorous |
12 |
| 507/141 |
Inorganic component contains soluble potassium salt |
41 |
| 507/144 |
Inorganic component is asbestos |
2 |
| 507/143 |
Inorganic component is elemental metal or alloy |
23 |
| 507/145 |
Inorganic component is soluble in boring medium |
97 |
| 507/102 |
Contains intended gaseous phase at entry into wellbore |
51 |
| 507/103 |
Contains organic component |
188 |
| 507/137 |
Organic component contains a carbocyclic group (e.g., cyclic alkyl, aromatic, tall oil, etc.) |
59 |
| 507/139 |
Organic component contains an alcohol group |
127 |
| 507/136 |
Organic component contains ether linkage (e.g., peg ether, etc.) |
171 |
| 507/105 |
Organic component contains fluorine bonded directly to carbon |
4 |
| 507/129 |
Organic component contains nitrogen attached directly or indirectly to carbon by nonionic bonding |
131 |
| 507/130 |
Nitrogen is part of a hetero ring |
55 |
| 507/131 |
Oxygen is attached directly or indirectly to carbon by nonionic bonding |
146 |
| 507/132 |
Organic component contains a nitrogen attached directly to oxygen by nonionic bonding (e.g., nitroaromatic, amineoxide, etc.) |
17 |
| 507/133 |
Organic component contains an ether linkage |
46 |
| 507/128 |
Organic component contains phosphorous attached directly or indirectly to carbon by nonionic bonding |
72 |
| 507/127 |
Organic component contains silicon attached directly or indirectly to carbon by nonionic bonding |
28 |
| 507/134 |
Organic component contains sulfur attached directly or indirectly to carbon by nonionic bonding |
40 |
| 507/135 |
Organic component contains a sulfur attached directly to carbon by nonionic bonding (e.g., sulfonate, etc.) |
105 |
| 507/138 |
Organic component is a fat, fatty alcohol, fatty oil, ester-type wax, fatty still residue, or higher fatty acid or salt thereof |
133 |
| 507/126 |
Organic component is asphalt or a component or derivative thereof |
30 |
| 507/110 |
Organic component is carbohydrate or derivative thereof (e.g., sugar or gum, such as galactomannan, xanthan, etc.) or carboxylic acid ester of an alcohol which has five or more hydroxy groups bonded directly to carbons |
198 |
| 507/112 |
Carbohydrate is cellulose or derivative thereof |
83 |
| 507/113 |
Carboxyalkylcellulose (e.g., cmc, cmhec, etc.) |
98 |
| 507/114 |
Hydroxyalkylcellulose (e.g., hec, etc.) |
112 |
| 507/115 |
Carbohydrate is hydroxyalkyl ether derivative (e.g., hpg, etc.) |
35 |
| 507/111 |
Carbohydrate is starch or derivative thereof |
97 |
| 507/116 |
Ester is higher fatty or carboxylic acid ester (e.g., sorbitan oleate, etc.) |
23 |
| 507/104 |
Organic component is cellular or fibrous material derived from plant or animal source (e.g., wood, nutshell, paper, leather, cotton, etc.) |
56 |
| 507/106 |
Organic component is lignin or humate or derivative thereof (e.g., tannin, quebracho extract, etc.) |
36 |
| 507/107 |
Humate component is fossilized (e.g., lignite, leonardite, brown coal, etc.) |
72 |
| 507/108 |
Lignin or humate component contains sulfur or is reacted with substance containing sulfur (e.g., lignosulfonate, etc.) |
63 |
| 507/109 |
Includes metal compound other than an alkali or alkaline earth metal compound (e.g., al, cr, fe, mn, cu, etc.) |
42 |
| 507/117 |
Organic component is solid synthetic resin |
57 |
| 507/118 |
Resin is polymer derived from ethylenic monomers only (e.g., maleic, itaconic, etc.) |
116 |
| 507/125 |
Carbocyclic ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding (e.g., styrene, vinyl toluene, etc.) |
39 |
| 507/123 |
Hetero nitrogen ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding |
34 |
| 507/124 |
Polymer contains vinyl alcohol unit |
44 |
| 507/119 |
Polymer derived from acrylic acid monomer or derivative |
150 |
| 507/120 |
Nitrogen is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamide, acrylonitrile, etc.) |
184 |
| 507/121 |
Sulfur is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamidoalkane sulfonates, etc.) |
84 |
| 507/122 |
Sulfur is attached directly or indirectly to the ethylenic monomer by nonionic bonding |
69 |
| 507/935 |
Enhanced oil recovery |
134 |
| 507/936 |
Flooding the formation |
553 |
| 507/937 |
With emulsion |
39 |
| 507/938 |
With microemulsion |
91 |
| 507/922 |
Fracture fluid |
413 |
| 507/923 |
Fracture acidizing |
57 |
| 507/924 |
With specified propping feature |
108 |
| 507/940 |
Freeing stuck object from wellbore |
26 |
| 507/907 |
Indicating means (e.g., dye, fluorescing agent, etc.) |
14 |
| 507/905 |
Nontoxic composition |
63 |
| 507/901 |
Organically modified inorganic solid |
59 |
| 507/926 |
Packer fluid |
90 |
| 507/90 |
Preventing contaminant deposits in petroleum oil conduits |
118 |
| 507/904 |
Process of making fluids or additives therefor |
98 |
| 507/906 |
Solid inorganic additive in defined physical form |
73 |
| 507/921 |
Specified breaker component for emulsion or gel |
132 |
| 507/927 |
Well cleaning fluid |
163 |
| 507/929 |
Cleaning organic contaminant |
42 |
| 507/930 |
Organic contaminant is asphaltic |
36 |
| 507/931 |
Organic contaminant is paraffinic |
56 |
| 507/932 |
Cleaning sulfur deposits |
28 |
| 507/928 |
Spacing slug or preflush fluid |
70 |
| 507/200 |
Well treating |
34 |
| 507/201 |
Contains enzyme or living micro-organism |
54 |
| 507/269 |
Contains inorganic component other than water or clay |
264 |
| 507/275 |
Inorganic component contains arsenic or antimony |
14 |
| 507/273 |
Inorganic component contains boron |
63 |
| 507/272 |
Inorganic component contains copper or zinc |
48 |
| 507/274 |
Inorganic component contains phosphorous |
23 |
| 507/276 |
Inorganic component contains potassium |
45 |
| 507/271 |
Inorganic component contains ti, zr, v, cr, mn, fe, or ni |
104 |
| 507/270 |
Inorganic component is elemental metal or alloy |
18 |
| 507/277 |
Inorganic component is soluble in the well treating medium |
211 |
| 507/202 |
Contains intended gaseous phase at entry into wellbore |
204 |
| 507/203 |
Contains organic component |
197 |
| 507/263 |
Organic component contains a carbocyclic group (e.g., cycloaliphatic, aromatic ring, tall oil, etc.) |
96 |
| 507/264 |
Organic component is a phenol |
49 |
| 507/268 |
Organic component contains a carbonyl group (e.g., aldehyde, ketone, etc.) |
106 |
| 507/266 |
Organic component contains an alcohol group |
343 |
| 507/267 |
Organic component contains carboxylic acid, ester, or salt thereof |
240 |
| 507/261 |
Organic component contains ether linkage (e.g., peg ether, etc.) |
361 |
| 507/262 |
Organic component contains a carbocyclic group |
140 |
| 507/205 |
Organic component contains fluorine bonded directly to carbon |
48 |
| 507/239 |
Organic component contains nitrogen attached directly or indirectly to carbon by nonionic bonding |
78 |
| 507/242 |
Nitrogen is part of a hetero ring |
73 |
| 507/243 |
Plural heteroatoms in the ring |
93 |
| 507/248 |
Organic component consists only of carbon, hydrogen, and nitrogen |
37 |
| 507/249 |
Organic component contains carbon double or triple bonded to nitrogen (e.g., cyano, nitrilo, etc.) |
12 |
| 507/250 |
Organic component is acyclic |
37 |
| 507/251 |
Organic component contains plural nitrogen atoms attached directly or indirectly to carbon by nonionic bonding |
35 |
| 507/241 |
Organic component contains plural carboxylic acid, ester, or salt groups attached directly or indirectly to nitrogen by nonionic bonding |
123 |
| 507/240 |
Organic component is quaternary ammonium salt |
239 |
| 507/244 |
Oxygen is attached directly or indirectly to carbon by nonionic bonding |
322 |
| 507/245 |
Organic component contains a nitrogen attached directly to oxygen by nonionic bonding (e.g., nitroaromatic, amineoxide, etc.) |
64 |
| 507/246 |
Organic component contains an ether linkage |
130 |
| 507/247 |
Sulfur is attached directly or indirectly to carbon by nonionic bonding |
24 |
| 507/235 |
Organic component contains phosphorus attached directly or indirectly to carbon by nonionic bonding |
24 |
| 507/237 |
Organic component contains a direct carbon to phosphorous nonionic bond (e.g., phosphonate, etc.) |
74 |
| 507/236 |
Organic component contains nitrogen attached directly or indirectly to carbon by nonionic bonding |
75 |
| 507/238 |
Organic component is a phosphate ester |
111 |
| 507/233 |
Organic component contains silicon attached directly or indirectly to carbon by nonionic bonding |
22 |
| 507/234 |
Organic component contains a direct carbon to silicon bond |
52 |
| 507/252 |
Organic component contains sulfur attached directly or indirectly to carbon by nonionic bonding |
30 |
| 507/256 |
Organic component contains a sulfur attached directly to carbon by nonionic bonding |
32 |
| 507/258 |
Alkyl and hydrogen attached directly to the same sulfur atom or to a chain of sulfur atoms by nonionic bonding |
30 |
| 507/257 |
Plural alkyls attached directly to the same sulfur atom or to a chain of sulfur atoms by nonionic bonding |
33 |
| 507/259 |
The sulfur is part of a sulfonate group |
308 |
| 507/253 |
Organic component contains ether linkage (i.e., c-o-c) |
11 |
| 507/254 |
The sulfur is part of a sulfate group |
118 |
| 507/255 |
The sulfur is part of a sulfonate group |
144 |
| 507/265 |
Organic component is a fat, fatty alcohol, fatty oil, ester-type wax, fatty still residue, or higher fatty acid or salt thereof |
144 |
| 507/232 |
Organic component is asphalt or a component or derivative thereof |
14 |
| 507/209 |
Organic component is carbohydrate or derivative thereof (e.g., sugar or gum, such as galactomannan, etc.) or carboxylic acid ester of an alcohol which has five or more hydroxy groups bonded directly to carbons |
139 |
| 507/210 |
Carbohydrate has been grafted onto solid synthetic resin |
7 |
| 507/211 |
Carbohydrate is polysaccharide |
359 |
| 507/213 |
Polysaccharide is a xanthan (e.g., scleroglucans, etc.) |
202 |
| 507/214 |
Polysaccharide is cellulose or derivative thereof |
79 |
| 507/215 |
Carboxyalkylcellulose (e.g., cmc, cmhec, etc.) |
150 |
| 507/216 |
Hydroxyalkylcellulose (e.g., hec, etc.) |
187 |
| 507/217 |
Polysaccharide is hydroxyalkyl ether derivative (e.g., hpg, etc.) |
129 |
| 507/212 |
Polysaccharide is starch or derivative thereof |
84 |
| 507/218 |
Ester is higher fatty or carboxylic acid ester (e.g., sorbitan oleate, etc.) |
30 |
| 507/204 |
Organic component is cellular or fibrous material derived from plant or animal source (e.g., wood, nutshell, paper, leather, cotton, etc.) |
58 |
| 507/206 |
Organic component is lignin or humate or derivative thereof (e.g., tannin, quebracho extract, etc.) |
40 |
| 507/207 |
Lignin or humate component contains sulfur or is reacted with substance containing sulfur (e.g., lignosulfonate, etc.) |
81 |
| 507/208 |
Includes metal compound other than an alkali or alkaline earth metal compound (e.g., al, cr, fe, mn, cu, etc.) |
11 |
| 507/260 |
Organic component is polycarboxylic acid, ester, or salt thereof |
176 |
| 507/219 |
Organic component is solid synthetic resin |
157 |
| 507/221 |
Resin is polymer derived from ethylenic monomers only (e.g., maleic, itaconic, etc.) |
130 |
| 507/231 |
Carbocyclic ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding (e.g., styrene, vinyl toluene, etc.) |
47 |
| 507/229 |
Hetero nitrogen ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding |
72 |
| 507/230 |
Polymer contains vinyl alcohol unit |
52 |
| 507/224 |
Polymer derived from acrylic acid monomer or derivative |
200 |
| 507/225 |
Nitrogen is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamide, acrylonitrile, etc.) |
376 |
| 507/226 |
Sulfur is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamidoalkane sulfonates, etc.) |
131 |
| 507/222 |
Polymer derived from monomer having quaternary ammonium group |
90 |
| 507/223 |
Nitrogen of the quaternary ammonium group is a member of a hetero ring |
14 |
| 507/227 |
Sulfur is attached directly or indirectly to the ethylenic monomer by nonionic bonding |
49 |
| 507/228 |
Monomer contains benzene ring and sulfonate group |
34 |
| 507/220 |
Resin is polymer derived from phenolic and aldehydic monomers |
52 |
