Patent US5723356A successfully refreshed from Google Patents.
Patent US3718494A successfully refreshed from Google Patents.
US3718494A
Expired / Lapsed
US
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Sheet-like alpha aluminum oxide
Assignee: EIDP Inc
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Filing: 1971-03-04
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Granted: 1973-02-27
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Expires: 1991-03-04
Abstract
Abstract Single crystals of alpha aluminum oxide are prepared in the form of sheet-like particles having an average thickness of 10 to 250 Mu and major faces averaging 15 to 1,000 m Mu 2. The particles find utility in reinforcement of plastics and can also be coated with TiO2 to give a lustrous pigment.
Inventors
- 👤 H Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:33
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C01; C01F; C01F7/00; C01F7/02; C01F7/20; C09; C09C; C09C1/00; C09C1/40; C09C1/407; C01P; C01P2002/00; C01P2002/60; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/20; C01P2004/60; C01P2004/61; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/12; C01P2006/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
65 words
Lustrous pigmentary material consisting essentially of particles in which a titanium dioxide coating forms a skin about a sheet-like single crystal of alpha aluminum oxide, the crystal having an average thickness of 10 to 250 m Mu and major faces averaging 15 to 1,000 Mu 2 in area, the weight ratio of TiO2: Al2O3 of the particles being in the range of 1:4 to 2:1.
References Cited (Backward Citations)
US3011870A
Cited
US3180741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |