Blackwood; Charles R.

Patent Applications and Registrations

Patent applications and USPTO patent grants for Blackwood; Charles R..The latest application filed is for "subsurface drainage system and drain structure therefor".

Company Profile

0.8.10

Blackwood; Charles R. - Oklahoma City OK

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Subsurface drainage system and drain structure therefor Grant 7,938,597 - Blackwood May 10, 2	2011-05-10
Subsurface drainage system and drain structure therefor Grant 7,815,395 - Blackwood October 19, 2	2010-10-19
Subsurface Drainage System And Drain Structure Therefor App 20100260546 - Blackwood; Charles R.	2010-10-14
Subsurface drainage system and method of installing the same Grant 7,578,635 - Blackwood August 25, 2	2009-08-25
Subsurface Drainage System And Drain Structure Therefor App 20090169303 - Blackwood; Charles R.	2009-07-02
Subsurface drainage system and drain structure therefor Grant 7,503,726 - Blackwood March 17, 2	2009-03-17
Subsurface Drainage System And Drain Structure Therefor App 20080095580 - Blackwood; Charles R.	2008-04-24
Subsurface drainage system and drain structure therefor Grant 7,341,401 - Blackwood March 11, 2	2008-03-11
Subsurface Drainage System And Drain Structure Therefor App 20080056824 - Blackwood; Charles R.	2008-03-06
Water Permeable Composite Material For Preventing Migration Of Soil And/or Sand Particles Into Drainage System App 20070284302 - Blackwood; Charles R.	2007-12-13
Subsurface drainage system and drain structure therefor Grant 7,290,958 - Blackwood November 6, 2	2007-11-06
Subsurface drainage system and drain structure therefor Grant 7,201,538 - Blackwood , et al. April 10, 2	2007-04-10
Subsurface drainage system and drain structure therefor App 20060275082 - Blackwood; Charles R.	2006-12-07
Subsurface drainage system and drain structure therefor Grant 7,108,454 - Blackwood September 19, 2	2006-09-19
Subsurface drainage system and drain structure therefor App 20060120804 - Blackwood; Charles R. ; et al.	2006-06-08
Subsurface drainage system and drain structure therefor App 20060120803 - Blackwood; Charles R.	2006-06-08
Subsurface drainage system and drain structure therefor App 20060078386 - Blackwood; Charles R.	2006-04-13
Subsurface drainage system App 20060029472 - Blackwood; Charles R. ; et al.	2006-02-09

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