Patent US2668122A successfully refreshed from Google Patents.
US2668122A
Expired / Lapsed
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Composite lead chromate-lead silicate pigment
Assignee: NL Industries Inc
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Filing: 1951-10-10
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Granted: 1954-02-02
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Expires: 1971-10-10
Abstract
No abstract record available.
Inventors
- 👤 Adrian R Pitrot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:46
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/14; C09C1/20; C09C1/34; C09C1/343; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A COMPOSITE LEAD CHROMATE LEAD SILICATE PIGMENT CONSISTING ESSENTIALLY OF PBO, CRO3, AND SIO2 IN PHYSICO-CHEMICAL COMBINATION, SAID PBO, CRO3 AND SIO2 BEING ANALYTICALLY PRESENT SO THAT THERE ARE FROM 2 TO 10 MOLS OF PBO FOR EACH MOL OF CRO3 AND FRO 0.75 TO 7.8 MOLS OF SIO2 FOR EACH MOL OF PBO.
Claim 2
Dependent Claim
54 words
A COMPOSITE LEAD CHROMATE LEAD SILICATE PIGMENT CONSISTING ESSENTIALLY OF PBO, CRO3, AND SIO2 IN PHYSICO-CHEMICAL COMBINATION, SAID PBO, CRO3 AND SIO2 BEING ANALYTICALLY PRESENT SO THAT THERE ARE FROM 2 TO 10 MOLS OF PBO FOR EACH MOL OF CRO3 AND FRO 0.75 TO 7.8 MOLS OF SIO2 FOR EACH MOL OF PBO.
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) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |