Patent US2885828A successfully refreshed from Google Patents.
US2885828A
Expired / Lapsed
US
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Process of making a multifocal lens blank
Assignee: Camelot Industries Corp
•
Filing: 1952-11-08
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Granted: 1959-05-12
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Expires: 1972-11-08
Abstract
No abstract record available.
Inventors
- 👤 Emerson Stanley Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:23
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/20; C03B23/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE19142E
Cited
US1158102A
Cited
US1632208A
Cited
US1932100A
Cited
US2033573A
Cited
US1942333A
Cited
US2035846A
Cited
US2065132A
Cited
US2053377A
Cited
US1995680A
Cited
US2053551A
Cited
US2030968A
Cited
GB440438A
Cited
US2071616A
Cited
US2177021A
Cited
US2177022A
Cited
US2274143A
Cited
US2405826A
Cited
US2447068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |