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Patent US2008874A successfully refreshed from Google Patents.
US2008874A
Expired / Lapsed
US
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Photo-electric tube
Assignee: AT&T Inc
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Filing: 1929-04-06
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Granted: 1935-07-23
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Expires: 1949-04-06
Abstract
No abstract record available.
Inventors
- 👤 Albert R Olpin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:36
CPC Classifications
H; H01; H01J; H01J40/00; H01J40/02; H01J40/04; H01J40/06
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) | 1938-07-22 | 1939-01-21 | 1939-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-07-22 | 1943-01-21 | 1943-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-07-22 | 1947-01-21 | 1947-07-23 | $7700.00 | Window Closed / Lapsed |