Patent US-1907-871926
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Extensive experiments which have extended over a period of a number of years have convinced me that the key to successful flying machines is a propeller of high efficiency. A propeller consisting of rotary aero-planes on the lines shown and described has, from actual tests made by me, shown a lifting force of 75 pounds per applied horse power. An aerial locomobile with this type of propeller, built entirely of high grade steel, and having 20 feet extreme diameter, weighs approximately 900 pounds and would have a carrying capacity of 2,400 pounds with applied power of 32 horse power.
- Inventor location (imputed by HistPat): Washington, DC (FIPSloc=11001), Northampton county, PA (FIPSloc=42095)
- Assigned ¼ to Emil Gathmann of Bethlehem, PA
- Witnesses were relatives it seems: Paul J. Gathmann and Olga L. Gathmann
- Tech class CPC B64C11/24: Hollow blades
Patent family descending from Patent US-1907-871926
- Patent US-1907-871926 (English title: Air-propeller for flying-machines, National tech categories: USPC 416/91 • USPC 416/198R • USPC 416/227A • USPC 416/227R)
- Patent GB-1907-18560 (English title: Improvements in Air Propellers for Flying Machines, Supplementary to patent: Patent US-1907-871926)
- Patent FR-1908-381251 (English title: Improvement to aerial propellers, Supplementary to patent: Patent US-1907-871926, National tech categories: FR 6.4)
Sources
- Patent 871926 document and bibliographic info on espacenet
- Patent 871926 at google patents
- Short's DB
- PTO 244
| Year filed | 1907 |
|---|---|
| Year granted | 1907 |
| Office | US |
| Patent number | 871926 |
| Inventors | Louis Gathmann |
| Inventor country | US |
| Applicant person | Louis Gathmann, Emil Gathmann |
| Applicant firm | |
| Applicant type | INDIV |
| Applicant is inventor? | 0 |
| Original title | Air-propeller for flying-machines |
| English title | Air-propeller for flying-machines |
| Tech fields | propulsion, propeller, airfoil, cargo |
| Filing date | 1907-03-06 |
| Full specification filed date | |
| Application number | 1907360818 |
| Grant date | 1907-11-26 |
| Granted? | 1 |
| Publication date | |
| Supplementary to patent | |
| Related to aircraft? | 1 |
| Serial number | 360818 |
| Patent agent | |
| Assigned to | |
| National tech categories | USPC 416/91, USPC 416/198R, USPC 416/227A, USPC 416/227R |
| IPCs | IPC B64C11/24 |
| CPCs | CPC B64C11/24 |
| Family year | 1907 |
| First filing? | 1 |
| Cites these patents | |
| Citations from after 1930 | |
| Application ID | |
| INPADOC family ID | |
| Number of text pages | 2 |
| Number of diagram pages | 2 |
| Number of figures | 4 |
| Number of claims | 10 |
