Patent US3537870A successfully refreshed from Google Patents.
US3537870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the posttreatment of titanium dioxide pigment
Assignee: Titan GmbH
•
Filing: 1967-10-27
•
Granted: 1970-11-03
•
Expires: 1987-10-27
Abstract
No abstract record available.
Inventors
- 👤 Helmut Grohmann
- 👤 Achim Kulling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:51
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3653; C09C1/3661; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C01P2004/88
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2512079A
Cited
US3036926A
Cited
US3060001A
Cited
US3088840A
Cited
US3112210A
Cited
US3253889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |