Patent US2628534A successfully refreshed from Google Patents.
US2628534A
Expired / Lapsed
US
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Neutral density filter screen
Assignee: Warner Bros Entertainment Inc
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Filing: 1951-04-03
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Granted: 1953-02-17
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Expires: 1971-04-03
Abstract
No abstract record available.
Inventors
- 👤 James A Gibbons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:57
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31975; Y10T428/31978
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2094770A
Cited
US2058433A
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US2384734A
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US2440070A
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US2534654A
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US2525638A
Cited
US2558243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |