US3271109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigmentary silicon carbide
Assignee: PPG Industries Inc
•
Filing: 1963-04-11
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Granted: 1966-09-06
•
Expires: 1983-04-11
Abstract
No abstract record available.
Inventors
- 👤 Eugene J Mezey
- 👤 Hans H W Schwantje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:37
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/97
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
A PROCESS FOR PRODUCING PIGMENTARY SILICON CARBIDE WHICH COMPRISES REACTING AN OXIDE OF SILICON WITH CARBON PARTICLES OF FROM 0.005 TO 1.5 MICRONS IN SIZE WHILE SAID CARBON IS IN THE FORM PARTICLES IN FLOWING INERT GASEOUS ATMOSPHERE WHEREBY TO FORM PIGMENTARY SILICON CARBODE.
Claim 2
Dependent Claim
44 words
A PROCESS FOR PRODUCING PIGMENTARY SILICON CARBIDE WHICH COMPRISES REACTING AN OXIDE OF SILICON WITH CARBON PARTICLES OF FROM 0.005 TO 1.5 MICRONS IN SIZE WHILE SAID CARBON IS IN THE FORM PARTICLES IN FLOWING INERT GASEOUS ATMOSPHERE WHEREBY TO FORM PIGMENTARY SILICON CARBODE.
Claim 3
Dependent Claim
45 words
A NOVEL PARTICULATE COMPOSITION OF PIGMENTARY SILICON CARBIDE, THE SILICON CARBIDE CONTENT OF WHICH CONSISTS OF SILICON CARBIDE PARTICLES, AT LEAST 80 PERCENT, ON A NUMBER BASIS, OF WHICH PARTICLES ARE SUBSTANTIALLY SPHERICAL AND HAVE A MEAN NUMBER PARTICLE SIZE BETWEEN 0.05 AND 0.4 MICRON.
Claim 4
Dependent Claim
45 words
A NOVEL PARTICULATE COMPOSITION OF PIGMENTARY SILICON CARBIDE, THE SILICON CARBIDE CONTENT OF WHICH CONSISTS OF SILICON CARBIDE PARTICLES, AT LEAST 80 PERCENT, ON A NUMBER BASIS, OF WHICH PARTICLES ARE SUBSTANTIALLY SPHERICAL AND HAVE A MEAN NUMBER PARTICLE SIZE BETWEEN 0.05 AND 0.4 MICRON.
References Cited (Backward Citations)
US875673A
Cited
US966399A
Cited
US1940308A
Cited
US2178773A
Cited
GB748808A
Cited
GB828211A
Cited
US3129188A
Cited
US3166380A
Cited
US3175884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |