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Patent applications and USPTO patent grants for Hill; Donald C..The latest application filed is for "fusion weld method and assembly for forming a fusion welded joint between pipe sections".
Patent | Date |
---|---|
Fusion weld method and assembly for forming a fusion welded joint between pipe sections Grant 4,906,313 - Hill March 6, 1 | 1990-03-06 |
Apparatus and method of forming fusion welded butt joint between thermoplastic pipe sections Grant 4,718,698 - Hill January 12, 1 | 1988-01-12 |
Pipe repair coupling Grant 4,386,796 - Lyall , et al. June 7, 1 | 1983-06-07 |
Biased open direct response valve with damping means Grant 4,257,452 - Hill , et al. March 24, 1 | 1981-03-24 |
Slip fit type tubing coupling Grant 4,243,254 - Hill , et al. January 6, 1 | 1981-01-06 |
Piston Ring Grant 3,704,893 - Hill December 5, 1 | 1972-12-05 |
Piston Ring Grant 3,627,333 - Hill December 14, 1 | 1971-12-14 |
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