US2561313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated oil-soluble copolymers
Assignee: Monsanto Chemicals Ltd
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Filing: 1948-12-10
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Granted: 1951-07-17
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Expires: 1968-12-10
Abstract
No abstract record available.
Inventors
- 👤 Theodore P Malinowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:18
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/12; C08F222/00; C08F222/04; C08F222/06; C08F222/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS FOR PREPARING A NEW COPOLYMER WHICH COMPRISES REACTING A MIXTURE OF 2-8 MOLECULAR PROPORTIONS OF ALPHA-METHYL STYRENE AND 1 MOLECULAR PROPORTION OF MALEIC ANHYDRIDE AT A TEMPERATURE OF 0-85* C. IN THE PRESENCE OF FULLER''S EARTH AS A CATALYST.
Claim 2
Dependent Claim
41 words
A PROCESS FOR PREPARING A NEW COPOLYMER WHICH COMPRISES REACTING A MIXTURE OF 2-8 MOLECULAR PROPORTIONS OF ALPHA-METHYL STYRENE AND 1 MOLECULAR PROPORTION OF MALEIC ANHYDRIDE AT A TEMPERATURE OF 0-85* C. IN THE PRESENCE OF FULLER''S EARTH AS A CATALYST.
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) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |