A method for making thermosetting resinous abrasive tools
Abstract
Abstract A method for producing an abrasive tool or structure which includes the steps of mixing an abrasive composition containing abrasive particles and, preferably, friable particles, with a liquid, multi-stage, thermosetting resin and coating substantially all of the individual particles with the resin; curing the resin to the B-stage while the resin is in contact with the particles to form a fusible solid coating on the particles and forming individual particles coated with said Bstage resin, and placing said resin coated particles in a mold and heating the particles sufficiently to render the resin tacky and fusible and, concurrently, applying sufficient pressure to form a coherent mass of said particles and curing the resin to a hard infusible state to form a high tensile strength bond between said particles. An abrasive tool composed of abrasive particles and lightweight, easily crushable, friable particles uniformly dispersed throughout the abrasive particles, each of the particles being bonded together with a high strength bond formed by a thermosetting resin cured to a hard and infusible state.
Inventors
- 👤 Noble D Whitaker
Bibliographic Details
Claims Analysis
Total Claims: 11References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |