US2847804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making lenses
Assignee: CONTINENTAL OPTICAL Co IN
•
Filing: 1957-01-25
•
Granted: 1958-08-19
•
Expires: 1977-01-25
Abstract
No abstract record available.
Inventors
- 👤 Tracy H Calkins
- 👤 Thomas S Hood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:35
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/0012
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1483866A
Cited
US2310925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |