US2540072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of copolymer of chloromaleic anhydride and butadiene
Assignee: Hercules Powder Co
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Filing: 1948-08-19
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Granted: 1951-01-30
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Expires: 1968-08-19
Abstract
No abstract record available.
Inventors
- 👤 John T Hays
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:17
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
THE PROCESS OF PREPARING A SOLUBLE COPOLYMER OF CHLOROMALEIC ANHYDRIDE AND BUTADIENE WHICH COMPRISES COPOLYMERIZING CHLOROMALEIC ANHYDRIDE AND BUTADIENE IN A MOLAR RATIO OF FROM ABOUT 1:1 TO ABOUT 1:10 IN THE PRESENCE OF A PEROXIDE CATALYST AND A KETONE SOLVENT.
Claim 2
Dependent Claim
41 words
THE PROCESS OF PREPARING A SOLUBLE COPOLYMER OF CHLOROMALEIC ANHYDRIDE AND BUTADIENE WHICH COMPRISES COPOLYMERIZING CHLOROMALEIC ANHYDRIDE AND BUTADIENE IN A MOLAR RATIO OF FROM ABOUT 1:1 TO ABOUT 1:10 IN THE PRESENCE OF A PEROXIDE CATALYST AND A KETONE SOLVENT.
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) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |