Drilldown: Patents

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

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Patent agent:
None (323) · Armengaud jeune (7) · Dony and Lejeune (5) · John P. Tarbox (4) · None (3) · Munn & Co. (3) · Warren S. Ostow (2) · P. Degroote (2) · Hippolyte Josse (2) · F. W. Barker (2) · J. Germain (2)
National tech categories:
None (325) · FR 6.4 (27) · DE 77h.5 (15) · HU V/h (4) · DE 77h.15 (2) · DE 77h.9 (2)
IPCs:
None (295) · IPC B64C13/00 (11) · IPC B64C17/00 (8) · IPC B64C13/12 (8) · IPC B64C3/00 (7) · IPC B64C35/00 (5) · IPC B64C3/54 (4) · IPC B64C1/00 (4) · IPC B64C3/38 (4) · IPC B64C39/00 (3) · IPC B64D27/00 (3) · IPC B64C27/04 (3) · IPC B64C9/02 (2) · IPC B64C27/10 (2) · IPC B64C25/00 (2) · IPC B64C23/00 (2) · IPC CPC B64C13/00 (2) · IPC B64C29/00 (2) · IPC B64C11/00 (2) · IPC B64B1/00 (2)
CPCs:
CPC B64C3/00 (29) · CPC B64C17/00 (27) · CPC B64C13/00 (25) · CPC B64C39/00 (24) · CPC B64C2700/6295 (23) · CPC B64C2700/6256 (18) · CPC B64C2700/6233 (17) · None (16) · CPC B64C23/005 (16) · CPC B64C2700/6212 (13) · CPC B64C2700/6235 (11) · CPC B64C13/12 (11) · CPC B64C2700/6274 (10) · CPC B64C35/00 (10) · CPC B64C3/385 (9) · CPC B64C3/185 (8) · CPC B64C11/04 (8) · CPC B64C2001/0081 (8) · CPC B64C1/00 (8) · CPC B64B1/00 (8)
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