US2674541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigment and method of making same
Assignee: Northern Minerals Inc
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Filing: 1949-05-20
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Granted: 1954-04-06
•
Expires: 1969-05-20
Abstract
No abstract record available.
Inventors
- 👤 Wainer Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:17
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0081; C09C1/0084; C09C1/0087; C01; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/62; C01P2004/80; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A PROCESS OF MAKING A TIO2-SIO2 CONTAINING PIGMENT WHICH INCLUDES THE STEPS OF REACTING A SULPHATE OF TIATANUM WITH A CALCIUM SILICATE CONTAINING MATERIAL WHEREIN THE MOLAR RATIO OF CALCIUM TO SILICON IS 1:1, AND CALCINING THE RESULTAND PRODUCT AT A TEMPERATURE OF AT LEAST 830* C. AND NOT OVER 870* C.
Claim 2
Dependent Claim
52 words
A PROCESS OF MAKING A TIO2-SIO2 CONTAINING PIGMENT WHICH INCLUDES THE STEPS OF REACTING A SULPHATE OF TIATANUM WITH A CALCIUM SILICATE CONTAINING MATERIAL WHEREIN THE MOLAR RATIO OF CALCIUM TO SILICON IS 1:1, AND CALCINING THE RESULTAND PRODUCT AT A TEMPERATURE OF AT LEAST 830* C. AND NOT OVER 870* C.
References Cited (Backward Citations)
USRE16956E
Cited
US1343447A
Cited
US1412027A
Cited
US1748429A
Cited
US2378790A
Cited
US2444237A
Cited
US2549261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |