US2453665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound optical element cemented with a polyester of fumaric acid
Assignee: Wyeth Holdings LLC
•
Filing: 1943-12-29
•
Granted: 1948-11-09
•
Expires: 1963-12-29
Abstract
No abstract record available.
Inventors
- 👤 Edward L Kropa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:06
CPC Classifications
G; G02; G02B; G02B1/00; Y; Y10; Y10S; Y10S525/00; Y10S525/932
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2092789A
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US2195362A
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US2305224A
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US2340109A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |