Patent US2658057A successfully refreshed from Google Patents.
US2658057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mass polymerization with mixture of 4, 4-dihydroxy benzoyl peroxide and adipoyl peroxide
Assignee: Monsanto Chemicals Ltd
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Filing: 1952-10-24
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Granted: 1953-11-03
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Expires: 1972-10-24
Abstract
No abstract record available.
Inventors
- 👤 Harold F Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:42
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/28; C08F4/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A MASS POLYMERIZATION PROCESS WHICH COMPRISES POLYMERIZING 100 PARTS OF A COMPOUND TAKEN FROM THE GROUP CONSISTING OF STYRENE AND VINYL HALIDES AT FROM 100 TO 400* C. AND 1 TO 500 ATMOSPHERES PRESSURE IN CONTACT WITH FROM 0.01 TO 5.0 PARTS OF AN EQUIMOLECULAR MIXTURE OF 4,4''DIHYDROXY BENZOYL PEROXIDE AND ADIPOYL PEROXIDE.
Claim 2
Dependent Claim
53 words
A MASS POLYMERIZATION PROCESS WHICH COMPRISES POLYMERIZING 100 PARTS OF A COMPOUND TAKEN FROM THE GROUP CONSISTING OF STYRENE AND VINYL HALIDES AT FROM 100 TO 400* C. AND 1 TO 500 ATMOSPHERES PRESSURE IN CONTACT WITH FROM 0.01 TO 5.0 PARTS OF AN EQUIMOLECULAR MIXTURE OF 4,4''DIHYDROXY BENZOYL PEROXIDE AND ADIPOYL PEROXIDE.
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) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |