US3838113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maleic anhydride copolymer
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1972-06-09
•
Granted: 1974-09-24
•
Expires: 1992-06-09
Abstract
Abstract 1:1 ALTERNATING COPOLYMER OF MALEIC ANHYDRIDE AND TETRAHYDROPHTHALIC ANHYDRIDE OR A HOMOLOGUE THEREOF AND A PROCESS FOR THE MANUFACTURE OF THESE COPOLYMERS. THE PRODUCTS ARE SOLUBLE IN WATER WITH HYDROLYSIS AND ARE USEFUL AS EMULSIFYING AGENTS, SIZES, WATER-SOFTENING AGENTS, METAL ION CHELATING AGENTS AND IN DETERGANT COMPOSITIONS AS SOIL-SUSPENDING OR ANTI-REDEPOSITION AGENTS AND AS BUILDERS.
Inventors
- 👤 R Smallman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:52
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3761; C08; C08F; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |