Patent US2643491A successfully refreshed from Google Patents.
US2643491A
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Grinding machine
Assignee: BURROUGHS OPTOMAT Inc
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Filing: 1950-12-05
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Granted: 1953-06-30
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Expires: 1970-12-05
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Burroughs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:47
CPC Classifications
B; B23; B23Q; B23Q1/00; B23Q1/25; B23Q1/26; B23Q1/28; B24; B24B; B24B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1617167A
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US1996842A
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US2174146A
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US2286361A
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US2325740A
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US2352616A
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US2377991A
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US2419543A
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US2441472A
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US2527791A
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US2516493A
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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) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |