US3387957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microcrystalline sintered bauxite abrasive grain
Assignee: Unifrax I LLC
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Filing: 1966-04-04
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Granted: 1968-06-11
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Expires: 1986-04-04
Abstract
No abstract record available.
Inventors
- 👤 Elmer E Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:24
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1418
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
AN ABRASIVE WHEEL COMPRISING MICROCRYSTALLINE, SINTERED BAUXITE ABRASIVE GRAIN OF CONTROLLED GRIT SIZE HAVING A LONGITUDINAL TO TRANSVERSE DIMENSIONAL RATIO SUBSTANTIALLY GREATER THAN 1:1 AND A UNIFORM CROSS SECTION NORMAL TO THE LENGTH THEREOF, AND A BOND THEREFOR.
Claim 2
Dependent Claim
38 words
AN ABRASIVE WHEEL COMPRISING MICROCRYSTALLINE, SINTERED BAUXITE ABRASIVE GRAIN OF CONTROLLED GRIT SIZE HAVING A LONGITUDINAL TO TRANSVERSE DIMENSIONAL RATIO SUBSTANTIALLY GREATER THAN 1:1 AND A UNIFORM CROSS SECTION NORMAL TO THE LENGTH THEREOF, AND A BOND THEREFOR.
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) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |