USPC 244/69
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U.S. patent classification subclass 244/69 is for patents related to contra-propeller arrangements: Aircraft structures arranged to reduce the rotary motion of the slip-stream of aircraft propellers.[1][2]
- USPC 440 - Marine Propulsion, subclasses 66+, for similar arrangements of marine propellers.
References
- ↑ 1.0 1.1 Description of category USPC 244/69 at uspto.gov
- ↑ Class 244: Aeronautics, Manual of U.S. Patent Classification, as of June 30, 2000
- ↑ https://www.uspto.gov/web/offices/ac/ido/oeip/taf/def/244.htm#69
Patents in category USPC 244/69
- Patent US-1911-1051093 (English title: Aerial trolley-car, Inventors: Joseph W. Fawkes • Emma C. Fawkes, Filing date: 1911-03-09)
| Enclosing categories | USPC 244/65 |
|---|---|
| Subcategories | |
| Keywords | Propellers |
| Start year | |
| End year |
