US3385834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hompolymerization of maleic anhydride
Assignee: GAF Chemicals Corp
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Filing: 1964-04-03
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Granted: 1968-05-28
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Expires: 1984-04-03
Abstract
No abstract record available.
Inventors
- 👤 Merijan Ashot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:03
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD OF HOMOPOLYMERIZING MALEIC ANHYDRIDE WHICH COMPRISES INITIATING HOMOPOLYMERIZATION OF MALEIC ANHYDRIDE WITH 1% BY WEIGHT BASED ON THE WEIGHT OF MALEIC ANHYDRIDE OF A FREE RADICAL HOMOPOLYMERIZATION INITIATOR SELECTED FROM THE GROUP CONSISTING OF DIBENZOYL PEROXIDE AND DI-T-BUTYL PEROXIDE AT A HOMOPOLYMERIZATION THRESHOLD TEMPERATURE OF AT LEAST 80*C. FOLLOWED BY ADDING FROM 3 TO 5 SUCCESSIVE INCREMENTS OF 1% BY WEIGHT OF SAID INHIBITOR.
Claim 2
Independent Claim
66 words
A METHOD OF HOMOPOLYMERIZING MALEIC ANHYDRIDE WHICH COMPRISES INITIATING HOMOPOLYMERIZATION OF MALEIC ANHYDRIDE WITH 1% BY WEIGHT BASED ON THE WEIGHT OF MALEIC ANHYDRIDE OF A FREE RADICAL HOMOPOLYMERIZATION INITIATOR SELECTED FROM THE GROUP CONSISTING OF DIBENZOYL PEROXIDE AND DI-T-BUTYL PEROXIDE AT A HOMOPOLYMERIZATION THRESHOLD TEMPERATURE OF AT LEAST 80*C. FOLLOWED BY ADDING FROM 3 TO 5 SUCCESSIVE INCREMENTS OF 1% BY WEIGHT OF SAID INHIBITOR.
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) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |