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US2937304A
Expired / Lapsed
US
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Electric-discharge device and cathode
Assignee: Revvity Inc
•
Filing: 1957-09-25
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Granted: 1960-05-17
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Expires: 1977-09-25
Abstract
No abstract record available.
Inventors
- 👤 Goldberg Seymour
- 👤 David S Goldstein
- 👤 Kenneth J Germeshausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:18
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2030396A
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US1968839A
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US2147426A
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US2212827A
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US2449113A
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US2534762A
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US2572881A
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US2512538A
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US2542348A
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US2607016A
Cited
US2617959A
Cited
US2650997A
Cited
US2824994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |