Patent US2882434A successfully refreshed from Google Patents.
US2882434A
Expired / Lapsed
US
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Tungsten concentrated arc lamp
Assignee: Western Union Telegraph Co
•
Filing: 1954-09-08
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Granted: 1959-04-14
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Expires: 1974-09-08
Abstract
No abstract record available.
Inventors
- 👤 William D Buckingham
- 👤 Robert C Aldridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:04
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/98; H01J2893/00; H01J2893/0048; H01J2893/0056
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2076671A
Cited
US1145735A
Cited
US1905153A
Cited
US2077288A
Cited
US2134267A
Cited
US2652510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |