Patent US2454988A successfully refreshed from Google Patents.
US2454988A
Expired / Lapsed
US
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Grinder speed control
Assignee: GALLMEYER AND LIVINGSTON CO
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Filing: 1945-06-25
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Granted: 1948-11-30
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Expires: 1965-06-25
Abstract
No abstract record available.
Inventors
- 👤 Vincent W Bunker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:03
CPC Classifications
B; B24; B24B; B24B47/00; B24B47/10; B24B47/18; Y; Y10; Y10S; Y10S451/00; Y10S451/915
Claims Analysis
Total Claims: 0
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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) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |