Patent US3276892A successfully refreshed from Google Patents.
US3276892A
Expired / Lapsed
US
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Composite normal lead chromate-silica pigment
Assignee: NL Industries Inc
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Filing: 1963-07-31
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Granted: 1966-10-04
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Expires: 1983-07-31
Abstract
No abstract record available.
Inventors
- 👤 Adrian R Pitrot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:33
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/34; C09C1/343; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A NEW COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF A SILICA PARTICLE COATED WITH NORMAL LEAD CHROMATE, SAID SILICA PRESENT FROM ABOUT 25% TO ABOUT 75% BASED ON THE TOTAL WEIGHT OF THE COMPOSITION.
Claim 2
Dependent Claim
33 words
A NEW COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF A SILICA PARTICLE COATED WITH NORMAL LEAD CHROMATE, SAID SILICA PRESENT FROM ABOUT 25% TO ABOUT 75% BASED ON THE TOTAL WEIGHT OF THE COMPOSITION.
References Cited (Backward Citations)
US3118780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |