Patent ??-1862-ah

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  • Seifert's research says: The propellers and wings were set upright for takeoff and ascent. After reaching the desired height, they were adjusted to propel in the horizontal. The helicopter could fly as a hang glider.
  • Inventor identified by Lilienthal museum as "CROWELL" and inferred here to be Luther C. Crowell because of similarly-dated Patent US-1862-35437 and the claim that he had 280 patents.[1]
  • We don't know what country this is from but is probably the U.S.; we don't have evidence yet that Crowell patented elsewhere.


Year filed
Year granted 1862
Office ??
Patent number ah
Inventors Luther C. Crowell
Inventor country
Applicant person
Applicant firm
Applicant type
Applicant is inventor? 1
Original title Convertiplan
English title Convertiplane
Tech fields
Filing date
Full specification filed date
Application number
Grant date
Granted? 1
Publication date
Supplementary to patent
Related to aircraft? Yes
Serial number
Patent agent
Assigned to
National tech categories
Family year 1862
First filing?
Number of citations
Cited by
Application ID
Number of text pages
Number of diagram pages
Number of figures
Number of claims

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