Robertson; Duane D.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Robertson; Duane D..The latest application filed is for "ratcheting cutting tool for plastic pipes".
- Robertson; Duane D. - Golden CO
- Robertson; Duane D. - Denver CO
| Patent | Date |
|---|---|
| Clampless fitting for plastic pipes Grant 8,328,241 - Mortensen , et al. December 11, 2 | 2012-12-11 |
| Ratcheting cutting tool for plastic pipes Grant 8,024,864 - Mortensen September 27, 2 | 2011-09-27 |
| Ratcheting Cutting Tool For Plastic Pipes App 20100139100 - Mortensen; Mark A. | 2010-06-10 |
| Self-locking cutting tool for plastic pipes Grant 7,549,226 - Mortensen June 23, 2 | 2009-06-23 |
| Self-locking Cutting Tool For Plastic Pipes App 20090139095 - Mortensen; Mark A. | 2009-06-04 |
| Removable, snap-on saddle and tap for irrigation pipes Grant 7,150,289 - Mortensen December 19, 2 | 2006-12-19 |
| Combined clamping and cutting tool for plastic pipes Grant 6,810,587 - Robertson November 2, 2 | 2004-11-02 |
| Pipe fitting with an aid to accommodate a coring tool App 20040070196 - Robertson, Duane D. | 2004-04-15 |
| Spring-biased cutting tool for plastic pipes Grant 6,370,780 - Robertson , et al. April 16, 2 | 2002-04-16 |
| Replacement fitting for rigid, plastic pipes App 20020033599 - Robertson, Duane D. | 2002-03-21 |
| Pipe fitting Grant 5,487,571 - Robertson January 30, 1 | 1996-01-30 |
| Cutting tool Grant 4,956,916 - Robertson September 18, 1 | 1990-09-18 |
| Pipe saddle Grant 4,789,189 - Robertson December 6, 1 | 1988-12-06 |
| Cutting tool for flexible plastic conduit Grant 4,336,652 - Robertson June 29, 1 | 1982-06-29 |
| Fitting for flexible plastic pipe Grant 3,980,325 - Robertson September 14, 1 | 1976-09-14 |
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