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Class Information
Number: 333
Name: Wave transmission lines and networks >
Description: A. GENERAL STATEMENT OF THE CLASS SUBJECT MATTER

Class Number	Class Name	No. of Patents
333/14	Amplitude compression and expansion systems (i.e., companders)	214
333/23	Artificial lines	32
333/81R	Attenuators	333
333/81A	Coaxial or microstrip	175
333/81B	Waveguide type	65
333/17.1	Automatically controlled systems	193
333/17.3	Impedance matching	234
333/17.2	Limiting of amplitude	105
333/18	With control of equalizer and/or delay network	429
333/24R	Coupling networks	227
333/25	Balanced to unbalanced circuits	184
333/26	Having long line elements	534
333/24C	Capacitive coupling	136
333/138	Delay lines including a lumped parameter	91
333/140	Physical structure	66
333/139	Variable parameter	112
333/141	Delay lines including elastic bulk wave propagation means	55
333/146	Helical propagation path	7
333/148	Including magnetostrictive transducers	64
333/142	Multipath propagation	30
333/143	Spurious signal reduction	28
333/145	Nonuniform propagation path	16
333/147	Propagation path has significant chemical or physical properties	45
333/149	Significant transducer structure	43
333/144	Variable delay	20
333/150	Delay lines including elastic surface wave propagation means	160
333/153	Including discontinuities within propagation means	144
333/154	Significant transmitting or receiving transducer structure	226
333/151	Spurious signal or mode cancellation means	129
333/155	Temperature stabilization or compensation	56
333/152	Variable delay	52
333/156	Delay lines including long line elements	234
333/160	Coaxial line	56
333/164	Control of delay with semiconductive means	219
333/162	Helical line structures and lines developed from a helical structure	34
333/163	Having plural concentric helices	4
333/161	Planar line structure (e.g., stripline)	333
333/157	Waveguide	101
333/159	Having mechanically movable delay control means	37
333/158	Including ferrite means	35
333/186	Electromechanical filter	181
333/201	Magnetostrictive wave transmission path	23
333/197	Plural mechanically coupled bar, plate, or rod-type resonating means	95
333/198	Plural interresonator coupling paths	34
333/199	Plural mechanically coupled disk resonators	11
333/200	Reed- or fork-type resonators	65
333/187	Using bulk mode piezoelectric vibrator	311
333/189	Plural coupled vibrators	377
333/190	Lattice structure	41
333/191	Monolithic structure	140
333/192	With electrical coupling	76
333/188	With means for varying response	99
333/193	Using surface acoustic waves	824
333/194	Including spurious signal prevention or reduction means	294
333/196	With response weighting means	312
333/195	With wave-modifying means (e.g., reflectors, resonators, diffractors, multistrip couplers, etc.)	705
333/28R	Equalizers	327
333/28T	Audio tone control	92
333/167	Frequency domain filters utilizing only lumped parameters	188
333/170	Bridge type	28
333/171	With variable response	17
333/185	Having significant physical structure	779
333/168	Including recurrent sections	55
333/172	Rc or rl type	231
333/175	Resonant, discrete frequency selective type	274
333/176	Including specific frequency rejection means	157
333/181	Smoothing type (e.g., direct current power supply filters or decoupling filters)	302
333/182	Feedthrough type	179
333/183	Resiliently mounted components	36
333/184	Monolithic structure	155
333/173	Synchronous filters	154
333/177	Transformer coupled	165
333/178	Including bandwidth adjusting, shaping, or stabilization means	17
333/179	With permeability tuning means	2
333/180	With variable coupling means	9
333/169	Wheatstone or lattice type	4
333/174	With variable response	228
333/165	Frequency or time domain filters and delay lines utilizing charge transfer devices	226
333/27	Interlinking long line	18
333/24.1	Nonreciprocal gyromagnetic type (e.g., directional phase shifters)	125
333/24.2	Nonreciprocal attenuators or isolators	274
333/24.3	Nonreciprocal polarization rotators	19
333/166	Time domain filters	197
333/202	Wave filters including long line elements	1008
333/206	Coaxial	517
333/207	Tunable	196
333/203	Digital structure	152
333/204	Stripline or microstrip	717
333/205	Tunable	223
333/208	Waveguide	214
333/212	Including directly coupled resonant sections	215
333/210	Including evanescent guide sections	48
333/211	Including frequency selective absorbing means	25
333/209	Tunable	150
333/32	With impedance matching	432
333/33	Having long line elements	627
333/35	Quarter-wave transformer type	87
333/34	Tapered	220
333/19	Differentiating or integrating systems	27
333/22R	Dissipating terminations for long lines	187
333/22F	Fluid-cooling	28
333/218	Frequency multipliers	71
333/245	Long line elements and components	168
333/260	Connectors and interconnections	385
333/261	Rotary coupling	62
333/263	Including variable impedance	106
333/246	Strip type	832
333/247	Semiconductor mounts	457
333/262	Switch	325
333/248	Waveguide elements and components	385
333/250	Active element mounting	63
333/249	Bend	46
333/254	Connectors and interconnections	129
333/256	Movable	29
333/257	In line	32
333/255	Quick disconnect	20
333/253	Including variable impedance	34
333/251	Mode suppressor	118
333/258	Switch	64
333/259	Mechanically movable	16
333/252	Window	98
333/236	Long lines	68
333/237	Leaky lines	76
333/243	Shielded type	152
333/244	Including spaced, electrically compensated, internal support means	51
333/238	Strip type	540
333/239	Waveguide type	192
333/242	Circular or helical structure	49
333/241	Flexible	29
333/240	Surface wave	22
333/99R	Miscellaneous	42
333/99MP	Multipactor applications	18
333/99PL	Plasma	77
333/99S	Superconductive	273
333/213	Negative resistance or reactance networks of the active type	57
333/216	Having negative impedance	38
333/217	Providing negative resistance	61
333/214	Simulating specific type of reactance	93
333/215	Using gyrator	57
333/16	Pilot current-controlled systems	28
333/15	Pilot line-controlled systems	7
333/1	Plural channel systems	200
333/100	Having branched circuits	154
333/132	For providing frequency separation	216
333/133	Utilizing electromechanical transducer	360
333/134	Utilizing long line element	470
333/135	Including waveguide element	168
333/117	Including hybrid-type network	153
333/123	Having coaxial element	18
333/120	Having hybrid ring junction	50
333/121	Having hybrid-t (e.g., magic-t)	34
333/122	Using waveguide	42
333/118	Having lumped parameters or impedances	47
333/119	Using transformer coil	56
333/136	Including long line element	175
333/137	Using waveguide	189
333/101	Including switching means	287
333/102	Having gyromagnetic operating means	13
333/105	Having mechanical switching means	165
333/108	For waveguide	48
333/106	Using rotary switching means	45
333/107	For tem lines	13
333/103	Having semiconductor operating means	279
333/104	Using tem lines	206
333/109	Using directional coupler	245
333/111	For providing adjustable coupling	58
333/110	For providing frequency separation	56
333/114	Having crossed-guide waveguide	21
333/112	Having lumped parameters or impedances	88
333/113	Having parallel-guide waveguide	99
333/115	Having tem lines	56
333/116	Using stripline	331
333/124	With impedance matching	145
333/129	For providing frequency separation	94
333/125	Including long line element	215
333/126	For providing frequency separation	197
333/127	Using tem lines	125
333/128	Stripline	224
333/131	Using coupled windings	63
333/130	Using resistors only	11
333/1.1	Nonreciprocal gyromagnetic type (e.g., circulators)	394
333/2	With automatic control	8
333/3	Line substitution	3
333/4	With balanced circuits	71
333/5	Plural balanced circuits	55
333/13	Resonator-type breakdown discharge systems (e.g., t-r or r-t systems)	39
333/219	Resonators (distributed parameter type)	515
333/227	Cavity resonator	119
333/230	With coupling	207
333/228	With mode suppressor	36
333/229	With temperature compensation	62
333/231	With tuning	79
333/232	Having movable element	108
333/233	Using movable wall	27
333/222	Coaxial or shielded	256
333/223	With tuning	92
333/224	Having movable element	42
333/225	Using movable shorting means	11
333/226	Using plunger, rod, or piston	44
333/219.1	Dielectric type	411
333/219.2	Magnetic type	101
333/220	Open wire or lecher line	4
333/221	With tuning	7
333/234	Temperature compensated	105
333/235	With tuning	355
333/12	Transmission line inductive or radiation interference reduction systems	545
333/21R	Wave mode converters	191
333/21A	Polarization converters	329
333/20	Wave-shaping	112