Drilldown: Patents

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Patents > Year granted: 1920 - 1929 & Tech fields : propeller or propulsion or None

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Supplementary to patent:
None (393) · Patent DE-1917-305040 (3) · Patent CA-1918-196108 (2) · Patent FR-1915-525800 (2) · Patent DE-1916-332540 (2) · Patent DE-1917-323641 (2)
Related to aircraft:
Patent agent:
None (363) · Armengaud jeune (4) · Munn & Co. (4) · None (3) · Dom. Casalonga (3) · Warren S. Ostow (2) · John P. Tarbox (2) · F. W. Barker (2) · Henry Lucke (2) · Dony and Lejeune (2) · M. Zerolo (2)
National tech categories:
None (343) · FR 6.4 (20) · DE 77h.6 (15) · DE 77h.5 (13) · HU V/h (5) · AT 77d (4) · FR 6.2 (2) · FR 5.8 (2)
IPCs:
None (324) · IPC B64C11/00 (8) · IPC B64C23/00 (6) · IPC B64C3/00 (6) · IPC B64C39/00 (6) · IPC B64C11/20 (5) · IPC B64C11/16 (4) · IPC B64C35/00 (4) · IPC B64C17/00 (4) · IPC B64C11/04 (4) · IPC B64C27/04 (3) · IPC B64C11/36 (3) · IPC B64C1/00 (3) · IPC F03D3/06 (3)
CPCs:
None (30) · CPC B64C3/00 (29) · CPC B64C39/00 (25) · CPC B64C2700/6295 (24) · CPC B64C17/00 (24) · CPC B64C23/005 (21) · CPC B64C2700/6233 (18) · CPC B64C11/04 (15) · CPC B64C13/00 (15) · CPC B64C2700/6256 (13) · CPC B64C2700/6274 (13) · CPC B64C2700/6235 (11) · CPC B64C2700/6212 (10) · CPC B64C35/00 (9)
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