Title:
HYDROPROPELLER
United States Patent 3514215


Inventors:
Williams, Paul E.
Application Number:
US3514215DA
Publication Date:
05/26/1970
Filing Date:
02/20/1969
Assignee:
Williams, Paul E.
Primary Class:
Other Classes:
416/203, 416/223R
International Classes:
B63H1/12; (IPC1-7): B63H1/00; B64C11/18
View Patent Images:
US Patent References:
3282352Dual air screw propeller1966-11-01
3065933Helicopter1962-11-27
1980614Electric fan1934-11-13
1862207Airplane propeller1932-06-07
1506937Blade1924-09-02
1095732N/A1914-05-05