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Patents > Year granted: 1920 & Applicant firm : Sperry Gyroscope Company or None

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Tech fields:
None (167) · airplane (62) · design (33) · propellers (32) · frame (26) · construction (26) · Wings (24) · Subsystem (23) · propulsion (18) · aerodynamics (15) · control (13) · stability (11) · Motors (11) · LTA (11) · propeller (11) · fuselage (9) · navigation (8) · whole (7)
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Supplementary to patent:
None (281) · Patent CA-1918-192493 (3) · Patent FR-1915-502520 (2)
Related to aircraft:
Patent agent:
None (225) · Armengaud jeune (9) · J. Germain (7) · M. Zerolo (7) · None (5) · Marks & Clerk (4) · Weismann et Marx (3) · Hippolyte Josse (3) · Lavoix et Mosès‎ (3) · Munn & Co. (3) · Émile Bert (3) · E. Wattier (2) · J. Fayollet (2) · A. M. & William Clark (2) · J. Bonnet-Thirion et Breton (2) · Paul Blum (2) · L. Chassevent (2) · W. P. Thompson & Co. (2) · Société G. Breton, P. Audy, J. Rousset, A. Vergé (2) · Dom. Casalonga (2)
National tech categories:
None (205) · FR 6.4 (50) · DE 77h.5 (11) · HU V/h (11) · DE 77h.6 (6) · NL 62 (3) · DE 77h.7 (3) · AT 77d (3) · FR 6.2 (3) · USPC 244/50 (2) · FR 6.8 (2) · USPC 244/90R (2) · FR 5.8 (2) · DK 77 (2) · DE 77h.9 (2) · FR 12.2 (2) · USPC 244/22 (2) · DE 77h Group 5 (2) · DE 77h.15 (2) · DE 77h.2 (2)
IPCs:
None (187) · IPC B64C3/00 (11) · IPC B64C17/00 (9) · IPC B64C13/00 (9) · IPC B64C11/00 (8) · IPC B64C39/00 (8) · IPC B64C3/56 (7) · IPC B64C11/04 (6) · IPC B64C1/06 (6) · IPC B64C1/00 (6) · IPC B64C25/00 (6) · IPC B64C35/00 (5) · IPC B64D27/00 (3) · IPC B64C3/18 (3) · IPC B64C23/00 (3)
CPCs:
None (28) · CPC B64C3/00 (23) · CPC B64C39/00 (19) · CPC B64C17/00 (18) · CPC B64C2700/6295 (16) · CPC B64C13/00 (16) · CPC B64C2700/6256 (15) · CPC B64C11/04 (13) · CPC B64C2700/6233 (13) · CPC B64C23/005 (13) · CPC B64C3/56 (8) · CPC B64C2700/6274 (8) · CPC B64C3/18 (8) · CPC B64C3/185 (7) · CPC B64C35/00 (7) · CPC B62C5/04 (7) · CPC B64C2700/6212 (6) · CPC B64C2700/6218 (6) · CPC B64F2700/6226 (6) · CPC B64C11/00 (6)
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Citations from after 1930:
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