Patent US3538509A successfully refreshed from Google Patents.
US3538509A
Expired / Lapsed
US
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Glare eliminating device
Assignee: Individual
•
Filing: 1968-12-10
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Granted: 1970-11-10
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Expires: 1988-12-10
Abstract
No abstract record available.
Inventors
- 👤 Konrad Sachse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:24
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/04; A61F9/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE513066A
Cited
US2002098A
Cited
GB296346A
Cited
US1744282A
Cited
US1960450A
Cited
US2582554A
Cited
US2601084A
Cited
US3092838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |