US3557065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of poly(maleic acid)
Assignee: FMC Corp
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Filing: 1969-09-29
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Granted: 1971-01-19
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Expires: 1989-09-29
Abstract
Abstract A METHOD FOR THE PREPARATION OF LIGHT COLORED POLY(MALEIC ACID) WHICH COMPRISES HOMOPOLYMERIZING MALEIC ANHYDRIDE IN THE PRESENCE OF AN ACYL MALEYL PEROXIDE INITIATOR AND A BORIC ACID COMPOUND AND, THEREAFTER, HYDROLYZING THE RESULTING POLY(MALEIC ANHYDRIDE). POLY(MALEIC ACID) AND SALTS THEREOF MAY BE EFFECTIVELY UTILIZED IN A WIDE VARIETY OF APPLICATION AND, NOTABLE, AS DETERGENT BUILDERS AND SURFACE ACTIVE AGENTS.
Inventors
- 👤 John H Blumberg
- 👤 Donald G Mackellar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:41
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C08; C08F; C08F22/00; C08F22/04; C08F8/00
Claims Analysis
Total Claims: 0
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |