US3567472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesium-aluminatespinel member having calcium oxide addition and method for preparing
Assignee: Philips North America LLC
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Filing: 1968-03-28
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Granted: 1971-03-02
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Expires: 1988-03-28
Abstract
Abstract LIGHT-TRANSMITTING SPINEL CERAMIC MEMBER, WHICH IS PARTICULARLY ADAPTED FOR USE AS A DISCHARGE DEVICE ARC TUBE, HAS ADDED THERETO A SMALL AMOUNT OF CALCIUM OXIDE. THE SPINEL MEMBER IS EASILY SINTERED AND HAS IMPROVED STRENGTH AND LIGHT-TRANSMISSION PROPERTIES. IN THE METHOD FOR PREPARING SUCH A MEMBER, A SMALL AMOUNT OF CALCIUM OXIDE IS DISTRIBUTED THROUGHOUT SPINEL POWDER, THE MIXTURE IS COMPACTED, AND THEREAFTER SINTERED IN ACCORDANCE WITH A PREDETERMINED SCHEDULE.
Inventors
- 👤 Raymond J Bratton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:06
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/16; C01F7/162; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/26; C01P; C01P2002/00; C01P2002/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |