Tracking the historical patents for the 2:1 turbine idea

Prior art. Lots of it apparently....

Patent number: 566747
Filing date: Jul 18, 1895
Issue date: Sep 1, 1896
Inventor: LAURENCE ENGBERG

Patent number: 662944
Filing date: Jan 18, 1900
Issue date: Dec 1900
Inventor: Jones

Patent number: 1075060
Filing date: Jun 10, 1912
Issue date: Oct 1913
Inventor: O'Toole

Patent number: 1201184
Filing date: May 8, 1915
Issue date: Oct 1916
Inventor: M. W. HOLBEN

Patent number: 1430406
Filing date: Nov 25, 1921
Issue date: Sep 1922
Inventor: Schulthes et al.

Patent number: 1651067
Filing date: Jan 23, 1926
Issue date: Nov 1927
Inventor: Nitardy

Patent number: 1741248
Filing date: Mar 19, 1928
Issue date: Dec 1929
Inventor: Nitardy

Patent number: 1741247
Filing date: Mar 5, 1928
Issue date: Dec 31, 1929
Inventor: OTTO J. NITARDY


Patent number: 2603300
Filing date: Jul 16, 1948
Issue date: Jul 1952
Inventor: C. A. KING

Patent number: 2542522
Filing date: Aug 23, 1945
Issue date: Feb 1951
Inventor: D. L. HINGS

Patent number: 4178126
Filing date: Sep 7, 1977
Issue date: Dec 11, 1979
Inventor: Gehres D. Weed

Patent number: 4282944
Filing date: May 22, 1979
Issue date: Aug 11, 1981
Inventor: J. Walter Trumpy

Patent number: 4303835
Filing date: Mar 31, 1980
Issue date: Dec 1, 1981
Inventor: Puran Bair

Patent number: 4764090
Filing date: Jan 9, 1984
Issue date: Aug 16, 1988
Inventor: David P. Danson
Assignees: Wind Feather, United Science ASC