Patent US2031530A successfully refreshed from Google Patents.
US2031530A
Expired / Lapsed
US
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Mounting for rimless lenses
Assignee: PENNSYLVANIA OPTICAL CO
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Filing: 1933-10-19
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Granted: 1936-02-18
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Expires: 1953-10-19
Abstract
No abstract record available.
Inventors
- 👤 Charles R Essick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:46
CPC Classifications
G; G02; G02C; G02C1/00; G02C1/02; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929; Y10S411/936
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-02-17 | 1939-08-19 | 1940-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-02-17 | 1943-08-19 | 1944-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-02-17 | 1947-08-19 | 1948-02-18 | $7700.00 | Window Closed / Lapsed |