US2686391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens grinding apparatus
Assignee: MITCHEL TYLER Co
•
Filing: 1951-06-11
•
Granted: 1954-08-17
•
Expires: 1971-06-11
Abstract
No abstract record available.
Inventors
- 👤 Harold M Porter
- 👤 Patrick H Reardon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:16
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/02; B24B13/023; B24B11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US609218A
Cited
US1516749A
Cited
US1588435A
Cited
US1706723A
Cited
US1811219A
Cited
US1870328A
Cited
US2075216A
Cited
US2585287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |