US3703501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinylnorbornene/maleic anhydride copolymers and process of preparing same
Assignee: Hi Tek Polymers Inc
•
Filing: 1971-08-12
•
Granted: 1972-11-21
•
Expires: 1991-08-12
Abstract
Abstract UNSATURATED POLYANHYDRIDES, USEFUL AS CURING AGENTS FOR EPOXY RESINS, ARE PREPARED BY THE FREE RADICAL ADDITION POLYMERIZATION OF VINYLNORBORENE AND MALEIC ANHYDRIDE, AND UP TO ABOUT 50 WEIGHT PERCENT OF OTHER MONOMERS IF DESIRED.
Inventors
- 👤 Roger L Mccartney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:42
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04; C08L; C08L63/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |