US3574645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent thoria-base ceramics containing y203 and method for producing same
Assignee: General Electric Co
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Filing: 1969-03-17
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Granted: 1971-04-13
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Expires: 1989-03-17
Abstract
Abstract THE PREPARATION OF HIGH DENSITY THORIA-BASE CERAMIC BODIES CONTAINING UP TO ABOUT 5 MOLE PERCET OF Y2O3 IS DISCLOSED. THESE BODIES HAVE HIGH ORDERS OF IN-LINE TRANSMISSION OF LIGHT AND ARE PREPARED BY PRESSING THE MIXED POWDERS AND SINTERING IN A HYDROGEN-WATER VAPOR ATMOSPHERE UNTIL THEORETICAL DENSITY IS ACHIEVED.
Inventors
- 👤 Richard C Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/51
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |