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Patents > Tech fields : Helicopter or propeller & Number of claims: 8-11

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Office:
Inventors:
Francis Alexander Barton (3) · Émile Dupont (2) · Louis Coutant Badeau (2) · Reinhold Schmiechen (2) · Charles F. Roper (2) · Hiram Stevens Maxim (2)
Inventor country:
Applicant person:
None (15) · Charles F. Roper (2) · Louis Coutant Badeau (2) · Francis Alexander Barton (2) · Reinhold Schmiechen (2) · Émile Dupont (2)
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Application number:
None (30)
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Related to aircraft:
Patent agent:
None (21) · Munn & Co. (5) · Haseltine, Lake & Co. (4) · W. D. Rowlingson (3) · Arthur Otto Sachse (2) · Michael J. Stark & Sons (2) · None (2)
National tech categories:
None (20) · FR 6.4 (4) · USPC 244/66 (3) · USPC 244/70 (2) · USPC 244/99.11 (2) · USPC 244/45R (2) · GB 4 without buoyant (2) · GB 4 starting (2) · GB 4 propel & steer (2) · GB 4 framework (2) · GB 4 aëroplanes (2) · USPC 244/12.1 (2) · USPC 244/6 (2) · USPC 244/51 (2) · AU 90.3 (2) · USPC 244/87 (2)
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Citations from after 1930:
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