US2745728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding wheels and method of making them
Assignee: Saint Gobain Abrasives Inc
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Filing: 1952-07-30
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Granted: 1956-05-15
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Expires: 1972-07-30
Abstract
No abstract record available.
Inventors
- 👤 Ernest P Irany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:06
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/34; B24D3/342; B24D3/344
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PROCESS OF MAKING A PHENOL-FORMALDEHYDE BONDED GRINDING WHEEL WHICH COMPRISES FORMING ON SULPHUR PARTICLES A SUBSTANTIALLY CONTINUOUS COATING OF A FILM FORMING SUBSTANCE IN A STATE IN WHICH SAID SUBSTANCE IS NON-REACTIVE TO PHENOL-FORMALDEHYDE RESINS DURING THE CURING THEREOF, MIXING THE COATED SULPHUR WITH ABRASIVE GRAINS AND A REACTIVE PHENOL-FORMALDEHYDE RESIN, MOLDING A GRINDING WHEEL FROM THE RESULTANT MIX, AND CURING THE MIX WITH HEAT TO FORM A GRINDING WHEEL HAVING GOOD BOND STRENGTH CONTAINING SULPHUR DUE TO PREVENTION OF THE DETERIORATION, DURING SAID CURING, OF THE RESIN BOND BY MEANS OF THE NON-REACTIVE COATING ON THE SULPHUR PARTICLES.
Claim 2
Dependent Claim
100 words
A PROCESS OF MAKING A PHENOL-FORMALDEHYDE BONDED GRINDING WHEEL WHICH COMPRISES FORMING ON SULPHUR PARTICLES A SUBSTANTIALLY CONTINUOUS COATING OF A FILM FORMING SUBSTANCE IN A STATE IN WHICH SAID SUBSTANCE IS NON-REACTIVE TO PHENOL-FORMALDEHYDE RESINS DURING THE CURING THEREOF, MIXING THE COATED SULPHUR WITH ABRASIVE GRAINS AND A REACTIVE PHENOL-FORMALDEHYDE RESIN, MOLDING A GRINDING WHEEL FROM THE RESULTANT MIX, AND CURING THE MIX WITH HEAT TO FORM A GRINDING WHEEL HAVING GOOD BOND STRENGTH CONTAINING SULPHUR DUE TO PREVENTION OF THE DETERIORATION, DURING SAID CURING, OF THE RESIN BOND BY MEANS OF THE NON-REACTIVE COATING ON THE SULPHUR PARTICLES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |