US3751522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft copolymers and process for their preparation
Assignee: Texaco Inc
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Filing: 1971-05-28
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Granted: 1973-08-07
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Expires: 1991-05-28
Abstract
Abstract GRAFT COPOLYMERS ARE PREPARED IN A TWO-STAGE PROCESS BY FIRST REACTING, FOR EXAMPLE, 1,2-POLYBUTADIENE OR AN ETHYLENE/PROPYLENE/ALKYLIDENE NORBORNENE TERPOLYMER, WITH A MIXTURE OF DINITROGEN TETROXIDE AND OXYGEN TO FORM A NITROOXIDIZED BACKBONE POLYMER HAVING INCORPORATED THEREIN NITRO AND PEROXY NITRATE FUNCTIONS WHICH SERVE, IN THE SECOND STAGE OF THE PROCESS, AS SITES FOR THE SUBSEQUENT GRAFT POLYMERIZATION OF AN ACRYLATE MONOMER.
Inventors
- 👤 D Lachowicz
- 👤 C Holder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:13
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/023; C08F279/00; C08F279/02; C08F8/00; C08F8/30; Y; Y10; Y10S; Y10S525/00; Y10S525/904; Y10S525/914
Claims Analysis
Total Claims: 0
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |