Thermosetting resin coatings
Abstract
Abstract THERE IS PROVIDED A THERMOPLASTIC RESIN COATING PROCESS WHICH PRODUCES A COATED PRODUCT THAT IS SUBSTANTIALLY FREE OF PIN HOLES. THE THERMOPLASTIC RESIN IS COATED ON A SOLID SUBSTRATE, E.G., THE INTERNAL SURFACE OF A CONCRETE PIPE, AND FINELY DIVIDED SOLID PARTICLES, HAVING A GREATEST DIMENSION LESS THAN THE COATING THICKNESS, ARE IMPINGED ON AND INTO THE COATING, WHILE THE COATING IS IN A FLOWABLE STATE, TO DISLODGE AND DISPLACE FROM THE COATING SUBSTANTIALLY ALL THE GASES ENTRAPPED IN THE COATING. THEREAFTER, THE COATING IS GELLED AND CURED. SUITABLY, THE COATING IS AN EPOXY RESIN AND THE SOLID PARTICLE ARE FINELY DIVIDED SAND WHICH PARTICLES HAVE BEEN IMPINGED ON THE COATING AT VELOCITIES OF BETWEEN 5 AND 75 FT./SEC.
Inventors
- 👤 John H Karrh
- 👤 George H Flowers Jr
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |