US2876072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coesite silica
Assignee: Saint Gobain Abrasives Inc
•
Filing: 1956-03-09
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Granted: 1959-03-03
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Expires: 1976-03-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Loring Coes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:24
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; H; H10; H10P; H10P95/00; C01P; C01P2006/00; C01P2006/10; C01P2006/60; C01P2006/90; Y; Y10; Y10S; Y10S425/00; Y10S425/026
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
42 words
A POLYMORPH OF SILICA, SIO2, CONSISTING OF CRYSTALLINE COESITE SILICA HAVING A SPECIFIC GRAVITY OF 3.0, HAVING A POSITIVE OPTICAL SIGN, ANOPTIC AXIAL ANGLE OF 54* AND A REFRACTIVE INDEX OF 1.60 ALPHA AND A HARDNESS CLOSE TO 8 ON MOHS''S SCALE.
Claim 2
Dependent Claim
42 words
A POLYMORPH OF SILICA, SIO2, CONSISTING OF CRYSTALLINE COESITE SILICA HAVING A SPECIFIC GRAVITY OF 3.0, HAVING A POSITIVE OPTICAL SIGN, ANOPTIC AXIAL ANGLE OF 54* AND A REFRACTIVE INDEX OF 1.60 ALPHA AND A HARDNESS CLOSE TO 8 ON MOHS''S SCALE.
Claim 3
Dependent Claim
33 words
PROCESS FOR PRODUCING A POLYMORPH OF SILICA COMPRISING HEATING SILICA CONTAINING MATERIAL TO A TEMPERATURE OF AT LEAST 600$ C. UNDER A PRESSURE OF AT LEAST 30,000 ATMOSPHERES FOR AT LEAST ONE HOUR.
Claim 4
Dependent Claim
33 words
PROCESS FOR PRODUCING A POLYMORPH OF SILICA COMPRISING HEATING SILICA CONTAINING MATERIAL TO A TEMPERATURE OF AT LEAST 600$ C. UNDER A PRESSURE OF AT LEAST 30,000 ATMOSPHERES FOR AT LEAST ONE HOUR.
References Cited (Backward Citations)
US2544414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |