US3141747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina abrasive
Assignee: Saint Gobain Abrasives Inc
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Filing: 1961-08-24
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Granted: 1964-07-21
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Expires: 1981-08-24
Abstract
No abstract record available.
Inventors
- 👤 Douglas W Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:01
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
AN ALUMINOUS ABRASIVE CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF FUSED ALPHA-ALUMINA AND A MINOR PROPORTION OF ZETA-ALUMINA, COMBINED LITHIUM BEING PRESSENT IN SAID ABRASIVE IN AN AMOUNT OF FROM 1.8 TO 9.0% BY WEIGHT, CALCULATED AS ZETA-ALUMINA.
Claim 2
Dependent Claim
38 words
AN ALUMINOUS ABRASIVE CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF FUSED ALPHA-ALUMINA AND A MINOR PROPORTION OF ZETA-ALUMINA, COMBINED LITHIUM BEING PRESSENT IN SAID ABRASIVE IN AN AMOUNT OF FROM 1.8 TO 9.0% BY WEIGHT, CALCULATED AS ZETA-ALUMINA.
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) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |