Patent US3852213A successfully refreshed from Google Patents.
US3852213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chelating compositions and detergent compositions pertaining to same
Assignee: ISP Investments LLC
•
Filing: 1972-01-12
•
Granted: 1974-12-03
•
Expires: 1992-01-12
Abstract
Abstract Chelating compositions comprising 97 - 70 percent PVM/MA copolymer and 3 - 30 percent borax, detergent, dyeing, scouring and like compositions containing the same and process for chelating calcium, magnesium, iron, manganese and the like ions using the chelating compositions of the invention.
Inventors
- 👤 W Cooney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:43
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/046; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/105; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
THE METHOD OF PREPARING A CHELATING COMPOSITION CONSISTING ESSENTIALLY OF 97-70 PERCENT OF A POLYVINYL METHYL ETHERMALEIC ANHYDRIDE COPOLYMER CHARACTERIZED BY THE FORMULA:
Claim 2
Independent Claim
23 words
THE METHOD OF PREPARING A CHELATING COMPOSITION CONSISTING ESSENTIALLY OF 97-70 PERCENT OF A POLYVINYL METHYL ETHERMALEIC ANHYDRIDE COPOLYMER CHARACTERIZED BY THE FORMULA:
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |