US2736642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive devices
Assignee: AT&T Inc
•
Filing: 1951-04-28
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Granted: 1956-02-28
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Expires: 1971-04-28
Abstract
No abstract record available.
Inventors
- 👤 William O Baker
- 👤 Richard O Grisdale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:41
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
AN ABRASIVE DEVICE HAVING AN ABRASIVE SURFACE FORMED OF A PLURALITY OF SHARP-EDGED PARTICLES OF LUSTROUS, HARD, SMOOTH, HOMOGENEOUS CARBON, HELD FRAGMENTS OF A BINDER, SAID PARTICLE OF CARBON BEING FRAGMENTS OF A CARBON BODY PRODUCED BY BAKING, IN AN OXYGEN-CONTAINING ATMOSPHERE AT BETWEEN 200* C. AND 300* C., A SOLID BODY CONSISTING OF A CROSS-LINKED HYDROCARBON POLYMER INCAPABLE OF SWELLING IN BENZENE TO MORE THAN 1.25 TIMES ITS ORIGINAL VOLUME, SAID POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF POLYMERIZED VINYL BENZENE, POLYMERIZED DIVINYL BENZENE, POLYMERIZED VINYL ACETYLENE AND THE COPOLYMER OF DIVINYL BENZENE WITH A MONOVINYL AROMATIC HYDROCARBON, AND DEHYDROGENATING SAID BAKED POLYMER BODY IN SITU BY HEATING IT AT A TEMPERATURE UNTIL ITS HYDROGEN CONTENT IS NOT MORE THAN .5 PER CENT BY WEIGHT OF THE CARBON.
Claim 2
Dependent Claim
130 words
AN ABRASIVE DEVICE HAVING AN ABRASIVE SURFACE FORMED OF A PLURALITY OF SHARP-EDGED PARTICLES OF LUSTROUS, HARD, SMOOTH, HOMOGENEOUS CARBON, HELD FRAGMENTS OF A BINDER, SAID PARTICLE OF CARBON BEING FRAGMENTS OF A CARBON BODY PRODUCED BY BAKING, IN AN OXYGEN-CONTAINING ATMOSPHERE AT BETWEEN 200* C. AND 300* C., A SOLID BODY CONSISTING OF A CROSS-LINKED HYDROCARBON POLYMER INCAPABLE OF SWELLING IN BENZENE TO MORE THAN 1.25 TIMES ITS ORIGINAL VOLUME, SAID POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF POLYMERIZED VINYL BENZENE, POLYMERIZED DIVINYL BENZENE, POLYMERIZED VINYL ACETYLENE AND THE COPOLYMER OF DIVINYL BENZENE WITH A MONOVINYL AROMATIC HYDROCARBON, AND DEHYDROGENATING SAID BAKED POLYMER BODY IN SITU BY HEATING IT AT A TEMPERATURE UNTIL ITS HYDROGEN CONTENT IS NOT MORE THAN .5 PER CENT BY WEIGHT OF THE CARBON.
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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) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |