US2643246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble copolymers of salts of monoalkyl esters of maleic acid
Assignee: Shawinigan Resins Corp
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Filing: 1951-05-29
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Granted: 1953-06-23
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Expires: 1971-05-29
Abstract
No abstract record available.
Inventors
- 👤 Wilfred K Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:33
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A POLYMERIZATION PROCESS WHICH COMPRISES REACTING TOGETHER IN AN AQUEOUS MEDIUM AND IN THE PRESENCE OF A POLYMERIZATION CATALYST, 10 MOLS OF A VINYL ESTER OF AN ALIPHATIC ACID CONTAINING 2-6 CARBON ATOMS AND 0.25 TO 1.0 MOL OF A MONOALKYL ESTER OF MALEIC ACID REACTED WITH AN ALKALINE REACTING MATERIAL TAKEN FROM THE GROUP CONSISTING OF AMMONIUM AND ALKALI METAL COMPOUNDS, THE SALT OF THE MONOALKYL MALEATE ACID BEING INTRODUCED INTO THE AQUEOUS MEDIUM CONTAINING THE VINYL ESTER AT SUCH A RATE THAT NOT OVER ABOUT 0.15 MOL OF UNREACTED MONOALKYL MALEATE SALT IS PRESENT AT ANY TIME THROUGHOUT THE POLYMERIZATION.
Claim 2
Dependent Claim
102 words
A POLYMERIZATION PROCESS WHICH COMPRISES REACTING TOGETHER IN AN AQUEOUS MEDIUM AND IN THE PRESENCE OF A POLYMERIZATION CATALYST, 10 MOLS OF A VINYL ESTER OF AN ALIPHATIC ACID CONTAINING 2-6 CARBON ATOMS AND 0.25 TO 1.0 MOL OF A MONOALKYL ESTER OF MALEIC ACID REACTED WITH AN ALKALINE REACTING MATERIAL TAKEN FROM THE GROUP CONSISTING OF AMMONIUM AND ALKALI METAL COMPOUNDS, THE SALT OF THE MONOALKYL MALEATE ACID BEING INTRODUCED INTO THE AQUEOUS MEDIUM CONTAINING THE VINYL ESTER AT SUCH A RATE THAT NOT OVER ABOUT 0.15 MOL OF UNREACTED MONOALKYL MALEATE SALT IS PRESENT AT ANY TIME THROUGHOUT THE POLYMERIZATION.
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) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |