US2805956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica pigment and method of preparing same
Assignee: Columbia Southern Chemical Corp
•
Filing: 1952-05-28
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Granted: 1957-09-10
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Expires: 1972-05-28
Abstract
No abstract record available.
Inventors
- 👤 Pechukas Alphonse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:08
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3009; C09C1/3027; C01P; C01P2002/00; C01P2002/02; C01P2002/50; C01P2002/52; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/50; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/80; C01P2006/82; C01P2006/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
FINELY DIVIDED, PRECIPITATED, HYDRATED, AMORPHOUS SILICA HAVING AN AVERAGE ULTIMATE PARTICLE SIZE OF 0.015 TO 0.05 MICRON AND CONTAINING SIO2 AND BOUND WATER IN THE PROPORTION CORRESPONDING TO THE FORMULA:
Claim 2
Dependent Claim
30 words
FINELY DIVIDED, PRECIPITATED, HYDRATED, AMORPHOUS SILICA HAVING AN AVERAGE ULTIMATE PARTICLE SIZE OF 0.015 TO 0.05 MICRON AND CONTAINING SIO2 AND BOUND WATER IN THE PROPORTION CORRESPONDING TO THE FORMULA:
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |