US2972808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic-to-metal seals
Assignee: LITTON ENGINEERING LAB
•
Filing: 1957-04-03
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Granted: 1961-02-28
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Expires: 1977-04-03
Abstract
No abstract record available.
Inventors
- 👤 Charles V Litton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:32
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B2235/00; C04B2235/02; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/65; C04B2235/656; C04B2235/6562; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/068; C04B2237/09; C04B2237/12; C04B2237/124; C04B2237/126; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/405; C04B2237/406; C04B2237/50; C04B2237/52; C04B2237/525; C04B2237/56; C04B2237/59; C04B2237/592; C04B2237/70; C04B2237/708; C04B2237/72; C04B2237/76; C04B2237/765; C04B2237/82; C04B2237/84
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US848978A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |