US2981980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of light polarizing elements
Assignee: Owens Corning
•
Filing: 1956-12-13
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Granted: 1961-05-02
•
Expires: 1976-12-13
Abstract
No abstract record available.
Inventors
- 👤 Brown Alfred Winsor
- 👤 Robert E Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:02
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00634; G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; Y; Y10; Y10S; Y10S260/00; Y10S260/41; Y10S264/00; Y10S264/53; Y10T; Y10T428/00; Y10T428/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2402176A
Cited
US726485A
Cited
US2017705A
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US2403731A
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US2669751A
Cited
US2682081A
Cited
US2780889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |