US2597645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rust inhibitive lead pigments
Assignee: NL Industries Inc
•
Filing: 1947-07-03
•
Granted: 1952-05-20
•
Expires: 1967-07-03
Abstract
No abstract record available.
Inventors
- 👤 Leonard M Kebrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:24
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/14; C09C1/18; C01; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/10; C01P2006/60; C01P2006/80; C01P2006/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR MANUFACTURING A LITHARGE FREE RED LEAD COMPOSITION WHICH COMPRISES FORMING A WATER SLURRY OF RED LEAD CONTAINING FREE PHO AND SLOWLY ADDING TO SAID SLURRY CHROMIE ACID IN AMOUNT TO CONVERT SAID FREE PBO TO LEAD CHROMATE AND FILTERING AND DRYING THE PRODUCT.
Claim 2
Dependent Claim
46 words
A PROCESS FOR MANUFACTURING A LITHARGE FREE RED LEAD COMPOSITION WHICH COMPRISES FORMING A WATER SLURRY OF RED LEAD CONTAINING FREE PHO AND SLOWLY ADDING TO SAID SLURRY CHROMIE ACID IN AMOUNT TO CONVERT SAID FREE PBO TO LEAD CHROMATE AND FILTERING AND DRYING THE PRODUCT.
References Cited (Backward Citations)
US987965A
Cited
US2044244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |