Patent US-1923-1444926
A small vertical propeller on top of an otherwise conventional airplane to help control it during landing.
"My invention . . . provide[s] an attachment for [aeroplanes to] facilitate landing within a restricted area and also assist in elevating the machine in climbing [using] a motor driven propeller adapted to be revolved in a substantially horizontal plane located near or over the center of mass of the machine and operating to lift the machine or retard its descent."
Tech classifications: CPC B64C23/005 Influencing air-flow over aircraft surfaces, not otherwise provided for by other means not covered by groups B64C23/02 - B64C23/08, e.g. by electric charges, magnetic panels, piezoelectric elements, static charges or ultrasounds
First serial number: 254917; Serial number after renewal: 589015
Inventor location (imputed from HistPat): Rochester, Monroe county, NY (FIPSloc=36055)
Sources
- Patent 1444926 document and bibliographic info on espacenet
- Patent 1444926 at google patents
| Year filed | 1918 |
|---|---|
| Year granted | 1923 |
| Office | US |
| Patent number | 1444926 |
| Inventors | William E. Lawn |
| Inventor country | |
| Applicant person | William E. Lawn |
| Applicant firm | |
| Applicant type | INDIV |
| Applicant is inventor? | Yes |
| Original title | Landing attachment for aeroplanes |
| English title | Landing attachment for aeroplanes |
| Tech fields | landing, aeroplane |
| Filing date | September 20, 1918 |
| Full specification filed date | September 18, 1922 |
| Application number | 25491718 |
| Grant date | February 13, 1923 |
| Granted? | Yes |
| Publication date | |
| Supplementary to patent | |
| Related to aircraft? | Yes |
| Serial number | 254917;589015 |
| Patent agent | |
| Assigned to | |
| National tech categories | USPC 244/6, USPC 244/66 |
| IPCs | IPC B64C23/00 |
| CPCs | CPC B64C2700/6274, CPC B64C23/005 |
| Family year | 1918 |
| First filing? | Yes |
| Cites these patents | |
| Citations from after 1930 | |
| Application ID | 49046921 |
| INPADOC family ID | 44606115 |
| Number of text pages | 3 |
| Number of diagram pages | 1 |
| Number of figures | 4 |
| Number of claims | 11 |
