US2999126A
Expired / Lapsed
US
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Facetted correction lens for minimizing keystoning of off-axis projectors
Assignee: HARRIES TELEVISION RES Ltd
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Filing: 1959-05-19
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Granted: 1961-09-05
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Expires: 1979-05-19
Abstract
No abstract record available.
Inventors
- 👤 Harries John Henry Owen
- 👤 Welford Walter Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:51
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |