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David A. Collins
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Downers Grove, IL, US
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Patents Grants
last 30 patents
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Patent Grant
Method for continuously making a helical type curved shaped turbine...
Patent number
10,458,390
Issue date
Oct 29, 2019
David A. Collins
B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Patents Applications
last 30 patents
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Patent Application
Helix Type Vertical Axis Turbine Blades and Method for Continuously...
Publication number
20170002793
Publication date
Jan 5, 2017
David A. Collins
B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information
Patent Application
Helix Type Vertical Axis Turbine Blades and Method for Continuously...
Publication number
20130343897
Publication date
Dec 26, 2013
David A. Collins
F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...