Patent US2431907A successfully refreshed from Google Patents.
US2431907A
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Grinding or polishing machine
Assignee: LAZARE KAPLAN AND SONS Inc
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Filing: 1946-04-29
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Granted: 1947-12-02
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Expires: 1966-04-29
Abstract
No abstract record available.
Inventors
- 👤 James J Barna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:29
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/16; B24B9/168
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US913414A
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US962274A
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US982408A
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US1049200A
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US1261765A
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US1452113A
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US1815336A
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US2163987A
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US2384253A
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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) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |