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Patents > Applicant firm: None & Tech fields : helicopter or wings

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Inventor country:
FR (399) · US (218) · DE (120) · GB (109) · HU (50) · AT (45) · BE (38) · None (31) · IT (31) · RU (30) · AU (17) · CH (12) · RO (12) · MC (8) · DK (8) · NL (7) · DZ (5) · AH (5) · CA (5) · IE (5)
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National tech categories:
FR 6.4 (392) · None (247) · HU V/h (67) · BE K (54) · AT 77d (40) · DE 77h.5 (30) · USPC 244/6 (18) · FR 6.3 (15) · IT 8 (15) · DK 77 (10) · DE 77h (9) · CH 129b (9) · RU Group V (8) · USPC 244/22 (8) · AU 90.3 (8) · USPC 244/65 (8) · USPC 244/17.19 (8) · USPC 244/17.21 (8) · DE 77 (7)
IPCs:
None (514) · IPC B64C39/00 (77) · IPC B64C17/00 (49) · IPC B64C27/04 (48) · IPC B64C1/00 (44) · IPC B64C3/00 (42) · IPC B64C23/00 (38) · IPC B64C33/02 (32) · IPC B64C3/38 (26) · IPC B64C3/52 (22) · IPC B64C11/00 (21) · IPC B64C3/54 (20) · IPC B64C3/56 (18) · IPC B64C13/00 (16) · IPC B64C3/48 (14) · IPC B64C33/00 (14) · IPC B64B1/00 (14) · IPC B64C27/00 (12) · IPC B64C3/14 (9) · IPC B64C31/04 (8)
CPCs:
None (353) · CPC B64C23/005 (64) · CPC B64C17/00 (54) · CPC B64C39/00 (52) · CPC B64C33/02 (49) · CPC B64C3/00 (44) · CPC B64C2700/6295 (42) · CPC B64C2700/6281 (42) · CPC B64C27/04 (34) · CPC B64C13/00 (30) · CPC B64C2700/6274 (24) · CPC B64C2700/6233 (24) · CPC B64C3/52 (24) · CPC B64C2700/6218 (20) · CPC B64C3/385 (20) · CPC B64C39/005 (19) · CPC B64C3/56 (19) · CPC B64B1/00 (18) · CPC B64C3/54 (18) · CPC B64C33/00 (18)
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Citations from after 1930:
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