US3846147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable suspensions of calcined clays
Assignee: Burgess Pigment Co
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Filing: 1972-06-05
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Granted: 1974-11-05
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Expires: 1992-06-05
Abstract
Abstract 1. A CALCINED CLAY PIGMENT SUSPENSION COMPRISING AT LEAST 40% BY WEIGHT OF CALCINED CLAY IN AN AQUEOUS MEDIUM AND FURTHER COMPRISING SUFFICIENT ALKALIZING AGENT BOTH TO IMPART A PH OF AT LEAST 8 TO SAID SUSPENSION AND TO STABILIZED SAID SUSPENSION AND RENDER IT FREE OF APPRECIABLE SETTLING OF PIGMENT, SAID ALKALIZING AGENT FURTHER PROVIDING SAID SUSPENSION WITH A PH SUFFICIENTLY HIGH TO RENDER SUCH SUSPENSION PUMPABLE.
Inventors
- 👤 M Tapper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:16
CPC Classifications
C; C09; C09D; C09D17/00; C09D17/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A CALCINED CLAY PIGMENT SUSPENSION COMPRISING AT LEAST 40% BY WEIGHT OF CALCINED CLAY IN AN AQUEOUS MEDIUM AND FURTHER COMPRISING SUFFICIENT ALKALIZING AGENT BOTH TO IMPART A PH OF AT LEAST 8 TO SAID SUSPENSION AND TO STABILIZED SAID SUSPENSION AND RENDER IT FREE OF APPRECIABLE SETTLING OF PIGMENT, SAID ALKALIZING AGENT FURTHER PROVIDING SAID SUSPENSION WITH A PH SUFFICIENTLY HIGH TO RENDER SUCH SUSPENSION PUMPABLE.
Claim 2
Dependent Claim
67 words
A CALCINED CLAY PIGMENT SUSPENSION COMPRISING AT LEAST 40% BY WEIGHT OF CALCINED CLAY IN AN AQUEOUS MEDIUM AND FURTHER COMPRISING SUFFICIENT ALKALIZING AGENT BOTH TO IMPART A PH OF AT LEAST 8 TO SAID SUSPENSION AND TO STABILIZED SAID SUSPENSION AND RENDER IT FREE OF APPRECIABLE SETTLING OF PIGMENT, SAID ALKALIZING AGENT FURTHER PROVIDING SAID SUSPENSION WITH A PH SUFFICIENTLY HIGH TO RENDER SUCH SUSPENSION PUMPABLE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |