US3846146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent articles of aluminum oxide and method of manufacturing said articles
Assignee: US Philips Corp
•
Filing: 1973-03-23
•
Granted: 1974-11-05
•
Expires: 1993-03-23
Abstract
Abstract 1. IN A FORMED ARTICLE CONSISTING OF MAGNESIUM OXIDECONTAINING AND ANOTHER METAL OXIDE-CONTAINING TRANSPARENT DENSELY SINTERED POLYCRYSTALLINE ALUMINUM OXIDE, THE IMPROVEMENT COMPRISING THAT THE OTHER METAL OXIDE IS CALCIUM OXIDE AND THAT THE CONTENT OF CALCIUM OXIDE IS 0.001-0.02% BY WEIGHT.
Inventors
- 👤 B Hunting
- 👤 G Jeunink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:24
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; H; H01; H01F; H01F27/00; H01F27/28; H01F27/2804; H01F27/2819
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
IN A FORMED ARTICLE CONSISTING OF MAGNESIUM OXIDECONTAINING AND ANOTHER METAL OXIDE-CONTAINING TRANSPARENT DENSELY SINTERED POLYCRYSTALLINE ALUMINUM OXIDE, THE IMPROVEMENT COMPRISING THAT THE OTHER METAL OXIDE IS CALCIUM OXIDE AND THAT THE CONTENT OF CALCIUM OXIDE IS 0.001-0.02% BY WEIGHT.
Claim 2
Dependent Claim
40 words
IN A FORMED ARTICLE CONSISTING OF MAGNESIUM OXIDECONTAINING AND ANOTHER METAL OXIDE-CONTAINING TRANSPARENT DENSELY SINTERED POLYCRYSTALLINE ALUMINUM OXIDE, THE IMPROVEMENT COMPRISING THAT THE OTHER METAL OXIDE IS CALCIUM OXIDE AND THAT THE CONTENT OF CALCIUM OXIDE IS 0.001-0.02% BY WEIGHT.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |