US3588573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina-rare earth oxide ceramic to metal seals for containing high temperature vapors
Assignee: Philips North America LLC
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Filing: 1967-12-29
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Granted: 1971-06-28
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Expires: 1987-12-29
Abstract
Abstract A FAMILY OF SEALING COMPOSITIONS FOR SEALING REFRACTORY METAL END CLOSURE MEMBERS TO TUBULAR POLYCRYSTALLINE ALUMINA ENVELOPES. THE SEALING COMPOSITIONS COMPRISE A MIXTURE OF ALUMINUM OXIDE AND ONE OR MORE RARE-EARTH OXIDES SELECTED FROM THE GROUP CONSISTING OF YTRIUM OXIDE, NEODYMIUM OXIDE, SAMARIUM OXIDE, GADOLINIUM OXIDE, EUROPIUM OXIDE, DYSPROSIUM OXIDE, PRASEODYMIUM OXIDE, TERBIUM OXIDE, HOLMIUM OXIDE, ERBIUM OXIDE, THULIUM OXIDE, YTTERBIUM OXIDE, AND LUTETIUM OXIDE IN NEARLY EUTECTIC PROPORTIONS.
Inventors
- 👤 Cheng-Lin Chen
- 👤 Robert J Zollweg
- 👤 Dietrich F Ennulat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:38
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/025; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B37/003; C04B37/005; H; H01; H01J; H01J5/00; H01J5/20; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/066; C04B2237/09; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/403; C04B2237/50; C04B2237/52; C04B2237/62; C04B2237/70; C04B2237/708; C04B2237/76; C04B2237/765; C04B2237/80; C04B2237/88; H01J2893/00; H01J2893/0033; H01J2893/0037
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |