US2821050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Edge grinding machine for lenses
Assignee: SHURON OPTICAL CO Inc
•
Filing: 1954-09-29
•
Granted: 1958-01-28
•
Expires: 1974-09-29
Abstract
No abstract record available.
Inventors
- 👤 James F Mccarthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:01
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/08; B24B9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1687252A
Cited
US2321383A
Cited
US2406606A
Cited
US2528137A
Cited
US2617236A
Cited
US2749671A
Cited
US2651890A
Cited
US2670575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |