USPC 244/71
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U.S. patent classification subclass 244/71 is for patents related to reciprocating propellers. Devices and arrangements with aircraft that use the thrust developed by elements moving back and forth over substantially the same path for propelling aircraft. These elements usually are designed to have reduced resistance to motion in one direction.[1][2]
References
- ↑ Description of category USPC 244/71 at uspto.gov
- ↑ Class 244: Aeronautics, Manual of U.S. Patent Classification, as of June 30, 2000
Patents in category USPC 244/71
- Patent US-1865-50365 (English title: Improvement in aerial cars, Inventors: Francis Just • August Koellner, Filing date: 1865-10-10)
- Patent US-1907-866673 (English title: Flying-machine, Inventors: Anthony O'Brate, Filing date: 1906-05-17)
- Patent US-1907-874263 (English title: Propelling apparatus, Inventors: Gustav Unzner, Filing date: 1907-07-05)
- Patent US-1908-948121 (English title: Flying machine, airship, and the like, Inventors: Vincent Wisniewski, Filing date: 1908-06-18)
- Patent US-1911-997804 (Inventors: Max GOEHLER, Filing date: 1910-06-28)
- Patent US-1912-1028093 (Inventors: August Ahlbrecht, Filing date: 1911-08-03)
- Patent US-1914-1099701 (Inventors: Elisha M HARTMAN, Filing date: 1913-07-03)
| Enclosing categories | USPC 244/62 |
|---|---|
| Subcategories | |
| Keywords | Propellers, Aerial propellers |
| Start year | |
| End year |
