US2999299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Base threading and welding method and apparatus
Assignee: GTE Sylvania Inc
•
Filing: 1956-10-29
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Granted: 1961-09-12
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Expires: 1976-10-29
Abstract
No abstract record available.
Inventors
- 👤 Stanley C Shappell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:40
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/24; H01J9/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1817746A
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US2390139A
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US2429287A
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US2729877A
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US2694433A
Cited
US2720690A
Cited
US2749528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |