Patent US5534018A successfully refreshed from Google Patents.
Patent US3118780A successfully refreshed from Google Patents.
US3118780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromated lead oxide-silica particles
Assignee: NL Industries Inc
•
Filing: 1960-08-04
•
Granted: 1964-01-21
•
Expires: 1980-08-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward J Dunn
- 👤 Kushner Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:23
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3045; C09C1/3054; C09C1/14; C09D; C09D167/00; C01; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A COMPOSITE PIGMENT PARTICLE HAVING SILICA CORE AND A LEAD COMPOUND COATING, SAID COATING SELECTED FROM THE GROUP CONSISTING OF MONOBASIC LEAD CHROMATE, MONOBASIC LEAD CHROMATE AND RED LEAD, AND NORMAL LEAD CHROMATE AND RED LEAD, SAID SILICA PRESENT FROM ABOUT 3.5% TO ABOUT 80% BASED ON THE TOTAL WEIGHT OF SAID PARTICLE, SAID PARTICLE BEING SUBSTANTIALLY DEVOID OF FREE LITHARGE AND LEAD SILICATE.
Claim 2
Dependent Claim
64 words
A COMPOSITE PIGMENT PARTICLE HAVING SILICA CORE AND A LEAD COMPOUND COATING, SAID COATING SELECTED FROM THE GROUP CONSISTING OF MONOBASIC LEAD CHROMATE, MONOBASIC LEAD CHROMATE AND RED LEAD, AND NORMAL LEAD CHROMATE AND RED LEAD, SAID SILICA PRESENT FROM ABOUT 3.5% TO ABOUT 80% BASED ON THE TOTAL WEIGHT OF SAID PARTICLE, SAID PARTICLE BEING SUBSTANTIALLY DEVOID OF FREE LITHARGE AND LEAD SILICATE.
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) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |