Clyde A. Willis — 22 Patents at W-N Apache

Clyde A. Willis has been granted 22 US patents while listed as an inventor at W-N Apache. The first was granted in 1981 and the most recent in March 1994. Clyde A. Willis ranks #189,202 of 4,157,543 US inventors in our database (top 4.6%). Patent records list Clyde A. Willis in Wichita Falls, TX, US.

Issued Patents All Time

Showing 1–22 of 22 patents

Patent #	Title	Co-Inventors	Date
5297833	Apparatus for gripping a down hole tubular for support and rotation	Clyde D. Durrett	1994-03-29
5294228	Automatic sequencing system for earth drilling machine	Jerry K. Lingafelter	1994-03-15
5273388	Lifting device for down hole tubulars	Gary T. Oatman	1993-12-28
5259723	Feeding device for down hole tubulars	Gary T. Oatman	1993-11-09
5036927	Apparatus for gripping a down hole tubular for rotation	—	1991-08-06
4842250	Line reeving system for earth drilling machine	Keith M. Haney	1989-06-27
4830119	Top head drive cooling system	Keith M. Haney	1989-05-16
4821814	Top head drive assembly for earth drilling machine and components thereof	Keith M. Haney	1989-04-18
4821816	Method of assembling a modular drilling machine	—	1989-04-18
4815546	Top head drive assembly with axially movable quill	Keith M. Haney	1989-03-28
4759414	Modular drilling machine and components thereof	—	1988-07-26
4650236	Automatic pipe elevator	Keith M. Haney	1987-03-17
4511169	Self locking and unlocking elevator assembly	—	1985-04-16
4509606	Axial return hammer	—	1985-04-09
4407373	Collapsible pedestal for drilling apparatus	Jerry K. Lingafelter	1983-10-04
4407629	Lifting apparatus for down-hole tubulars	—	1983-10-04
4403897	Self-centering clamp for down-hole tubulars	—	1983-09-13
4403666	Self centering tongs and transfer arm for drilling apparatus	—	1983-09-13
4366606	Self-centering clamp for down-hole tubulars	Jerry K. Lingafelter	1983-01-04
4314611	Apparatus for supporting and rotating a down hole tubular	—	1982-02-09
4280535	Inner tube assembly for dual conduit drill pipe	—	1981-07-28
4274497	Skirted hammer sub for dual tube drilling	George Ford	1981-06-23

Clyde A. Willis — 22 Patents

Issued Patents All Time

Patent Widget