US2904747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube clamp
Assignee: Polarad Electronics Corp
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Filing: 1957-11-01
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Granted: 1959-09-15
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Expires: 1977-11-01
Abstract
No abstract record available.
Inventors
- 👤 Frank J Skwarek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:08
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/24; G01R31/25; H; H01; H01R; H01R13/00; H01R13/02; H01R13/193; Y; Y10; Y10S; Y10S439/00; Y10S439/912; Y10T; Y10T24/00; Y10T24/44; Y10T24/44239
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |