US3751523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage process for preparing graft copolymers
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 DINITROGEN TETROXIDE TO FORM A NITRATED BACKBONE POLYMER HAVING INCORPORATED THEREIN NITRO AND NITRITE FUNCTIONS WHICH SERVE, IN THE SECOND STAGE OF THE PROCESS, AS SITES FOR THE SUBSEQUENT GRAFT COPOLYMERIZATION OF AN ACRYLATE MONOMER.
Inventors
- 👤 D Lachowicz
- 👤 C Holder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:46
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/023; C08C; C08C19/00; C08C19/22; 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 |