Patent US2808688A successfully refreshed from Google Patents.
US2808688A
Expired / Lapsed
US
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Laminated grinding wheel
Assignee: GEN GRINDING WHEEL CORP
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Filing: 1953-09-24
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Granted: 1957-10-08
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Expires: 1973-09-24
Abstract
No abstract record available.
Inventors
- 👤 Macmaster Harry Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:08
CPC Classifications
B; B24; B24D; B24D5/00; B24D5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2284716A
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US2334572A
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US2375263A
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US2405524A
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US2532248A
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US2540112A
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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) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |