US2985539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treated red lead
Assignee: NL Industries Inc
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Filing: 1958-11-28
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Granted: 1961-05-23
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Expires: 1978-11-28
Abstract
No abstract record available.
Inventors
- 👤 Konig Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:42
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/14; C09C1/18; C01; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PIGMENT COMPOSITION CONSISTING ESSENTIALLY OF RED LEAD, AND AT LEAST ONE ADDITIVE SELECTED FROM THE CLASS CONSISTING OF A LEAD SALT OF TETRACARBOXYBUTANE, AND A MIXTURE OF LITHARGE AND TETRACARBOXYBUTANE, SAID ADDITIVE BEING PRESENT IN THE AMOUNT OF FROM 4.24% TO ABOUT 15% BY WEIGHT BASED ON THE COMBINED WEIGHT OF SAID RED LEAD AND SAID ADDITIVE, SAID LITHARGE AND SAID TETRACARBOXYBUTANE BEING PRESENT IN THE PROPORTION OF AT LEAST 1 MOLE OF TETRACARBOXYBUTANE PER 2 MOLES OF LITHARGE.
Claim 2
Dependent Claim
80 words
A PIGMENT COMPOSITION CONSISTING ESSENTIALLY OF RED LEAD, AND AT LEAST ONE ADDITIVE SELECTED FROM THE CLASS CONSISTING OF A LEAD SALT OF TETRACARBOXYBUTANE, AND A MIXTURE OF LITHARGE AND TETRACARBOXYBUTANE, SAID ADDITIVE BEING PRESENT IN THE AMOUNT OF FROM 4.24% TO ABOUT 15% BY WEIGHT BASED ON THE COMBINED WEIGHT OF SAID RED LEAD AND SAID ADDITIVE, SAID LITHARGE AND SAID TETRACARBOXYBUTANE BEING PRESENT IN THE PROPORTION OF AT LEAST 1 MOLE OF TETRACARBOXYBUTANE PER 2 MOLES OF LITHARGE.
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) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |