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US1800044A
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Apparatus for producing a varying light or illumination
Assignee: Baird Television Ltd
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Filing: 1927-10-07
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Granted: 1931-04-07
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Expires: 1947-10-07
Abstract
No abstract record available.
Inventors
- 👤 Baird John Logie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:55
CPC Classifications
F; F21; F21V; F21V11/00; G; G09; G09F; G09F13/00; G09F13/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-04-06 | 1934-10-06 | 1935-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-04-06 | 1938-10-06 | 1939-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-04-06 | 1942-10-06 | 1943-04-07 | $7700.00 | Window Closed / Lapsed |