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Patent US2521900A successfully refreshed from Google Patents.
US2521900A
Expired / Lapsed
US
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Chip breaking device
Assignee: AT&T Inc
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Filing: 1945-09-01
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Granted: 1950-09-12
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Expires: 1965-09-01
Abstract
No abstract record available.
Inventors
- 👤 Robert A Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:20
CPC Classifications
B; B23; B23B; B23B47/00; B23B47/34; Y; Y10; Y10T; Y10T408/00; Y10T408/23; Y10T74/00; Y10T74/18; Y10T74/18024
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) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |