US3055873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyitaconic acid
Assignee: Pfizer Inc
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Filing: 1960-07-27
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Granted: 1962-09-25
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Expires: 1980-07-27
Abstract
No abstract record available.
Inventors
- 👤 Ezekiel H Hull
- 👤 James M Leach
- 👤 Bryce E Tate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:06
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/10; C08F22/12; C08F22/16; C08F8/00; C08F8/12; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A PROCESS FOR THE PREPARATION OF A WATER-SOLUBLE POLYCARBOXYLIC ACID RESIN COMPRISING THE FREE-RADICAL POLYMERIZATION AT A TEMPERATURE BETWEEN ABOUT 25 AND ABOUT 140*C., OF A B-MONOALKYL ESTER OF ITACONIC ACID WITH FROM 0 TO ABOUT 25% OF A COMONOMER HAVING ONE POLYMERIZABLE DOUBLE BOND, FOLLOWED BY HYDROLYSIS OF THE RESULTING POLYMER.
Claim 2
Dependent Claim
52 words
A PROCESS FOR THE PREPARATION OF A WATER-SOLUBLE POLYCARBOXYLIC ACID RESIN COMPRISING THE FREE-RADICAL POLYMERIZATION AT A TEMPERATURE BETWEEN ABOUT 25 AND ABOUT 140*C., OF A B-MONOALKYL ESTER OF ITACONIC ACID WITH FROM 0 TO ABOUT 25% OF A COMONOMER HAVING ONE POLYMERIZABLE DOUBLE BOND, FOLLOWED BY HYDROLYSIS OF THE RESULTING POLYMER.
References Cited (Backward Citations)
US2294226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |