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US3531853A
Expired / Lapsed
US
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Method of making a ceramic-to-metal seal
Assignee: US Philips Corp
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Filing: 1967-11-08
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Granted: 1970-10-06
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Expires: 1987-11-08
Abstract
No abstract record available.
Inventors
- 👤 Johannes Theodorus Klomp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:03
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/021; C04B35/00; C04B35/622; C04B35/64; C04B35/645; H; H01; H01J; H01J61/00; H01J61/02; H01J61/36; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6567; C04B2235/658; C04B2235/6582; C04B2237/00; C04B2237/30; C04B2237/40; C04B2237/405; C04B2237/406; C04B2237/408; C04B2237/50; C04B2237/56; C04B2237/567; C04B2237/70; C04B2237/704
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) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |