Patent US1428209A successfully refreshed from Google Patents.
US1428209A
Expired / Lapsed
US
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Mechanism for lapping diamond dies
Assignee: AT&T Inc
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Filing: 1920-04-06
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Granted: 1922-09-05
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Expires: 1940-04-06
Abstract
No abstract record available.
Inventors
- 👤 Blount Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:22
CPC Classifications
B; B24; B24B; B24B5/00; B24B5/36; B24B5/48; B24B5/485
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1925-09-04 | 1926-03-06 | 1926-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-09-04 | 1930-03-06 | 1930-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-09-04 | 1934-03-06 | 1934-09-05 | $7700.00 | Window Closed / Lapsed |