Patent US2942131A successfully refreshed from Google Patents.
US2942131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diemer
Assignee: —
•
Filing: —
•
Granted: 1960-06-21
•
Expires: 1977-06-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:50
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/0121; G02F1/0123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2818531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |