US2976250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matte-suspensions
Assignee: GAF Chemicals Corp
•
Filing: 1956-02-17
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Granted: 1961-03-21
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Expires: 1976-02-17
Abstract
No abstract record available.
Inventors
- 👤 Raymond J Walford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:12
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/141; C01B33/1415; C01B33/1417; G; G03; G03C; G03C1/00; G03C1/76; G03C1/95; Y; Y10; Y10S; Y10S430/00; Y10S430/151
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A STABILIZED SUSPENSION OF SILICON DIOXIDE IN WATER CONSISTILNG ESSENTIALLY OF WATER, SILICON DIOXIDE HAVING A PARTICLE SIZE RANGING FROM 1 TO 10 MICRONS AND A QUATERNARY AMMONIUM SALT CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
35 words
A STABILIZED SUSPENSION OF SILICON DIOXIDE IN WATER CONSISTILNG ESSENTIALLY OF WATER, SILICON DIOXIDE HAVING A PARTICLE SIZE RANGING FROM 1 TO 10 MICRONS AND A QUATERNARY AMMONIUM SALT CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |