US2976452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic rod spacers for use in mass producible electron tubes
Assignee: GTE Sylvania Inc
•
Filing: 1954-11-04
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Granted: 1961-03-21
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Expires: 1974-11-04
Abstract
No abstract record available.
Inventors
- 👤 Mortimer E Weiss
- 👤 Craig M Garretson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:17
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/42; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2064981A
Cited
US2197526A
Cited
US2355083A
Cited
US2413006A
Cited
US2463635A
Cited
US2503806A
Cited
US2660688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |