Patent US3028250A successfully refreshed from Google Patents.
US3028250A
Expired / Lapsed
US
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Composite zinc pigments
Assignee: NL Industries Inc
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Filing: 1958-01-14
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Granted: 1962-04-03
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Expires: 1978-01-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward J Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:05
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/04; C09C1/043; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/10; C01P2006/19; C01P2006/60; C01P2006/80; C01P2006/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
IN COCALCINED ZINC-OXIDE-SILICA PIGMENT CONSISTING ESSENTIALLY OF ZNO AND SIO2, SAID PIGMENT CHARACTERIZED BY THE ABSENCE OF ZINC SILICATE WHEREIN SAID ZNO AND SIO2 ARE PRESENT IN PROPORTIONS BY WEIGHT BETWEEN ABOUT 20%-80% AND 80%-20% BASED ON THE COMBINED WEIGHT OF SAID ZINC OXIDE AND SAID SILICA.
Claim 2
Dependent Claim
47 words
IN COCALCINED ZINC-OXIDE-SILICA PIGMENT CONSISTING ESSENTIALLY OF ZNO AND SIO2, SAID PIGMENT CHARACTERIZED BY THE ABSENCE OF ZINC SILICATE WHEREIN SAID ZNO AND SIO2 ARE PRESENT IN PROPORTIONS BY WEIGHT BETWEEN ABOUT 20%-80% AND 80%-20% BASED ON THE COMBINED WEIGHT OF SAID ZINC OXIDE AND SAID SILICA.
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) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |