US2491219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work holder for use in grinding and polishing lenses
Assignee: Individual
•
Filing: 1948-11-09
•
Granted: 1949-12-13
•
Expires: 1968-11-09
Abstract
No abstract record available.
Inventors
- 👤 Seidner Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:02
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17291; Y10T279/17316; Y10T279/17324; Y10T279/17333; Y10T279/17351
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1447983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |