US3789038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of low molecular weight polyanhydrides and epoxy compositions derived therefrom
Assignee: PLASKON ELECTRONIC MATERIALS Inc A DE CORP
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Filing: 1973-03-26
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Granted: 1974-01-29
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Expires: 1993-03-26
Abstract
Abstract POLYANHYDRIDES ARE PRODUCED BY A NOVEL BULK POLYMERIZATION PROCEDURE FROM MALEIC MONOMERS AND ALKYL STYRENES. THE POLYANHYDRIDES, OF LOW MOLECULAR WEIGHT AND CONTAINING MALEIC MONOMER TO ALKYL STYRENE IN A RATIO GREATER THAN 1 TO 1, ARE PARTICULARLY USEFUL AS HARDENERS FOR EPOXY RESIN-CONTAINING COMPOSITIONS AND GIVE RISE TO EPOXY COMPOSITIONS WHICH RESULT IN CURED PRODUCTS EXHIBITING HIGH HEAT DISTORTION TEMPERATURES AND EXCELLENT ELECTRICAL AND SHELF LIFE PROPRETIES.
Inventors
- 👤 O Curtis
- 👤 H Tuller
- 👤 R Nussbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:14
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F22/00; C08F222/00; C08F222/04; C08F222/06; C08F222/08; C08F8/00; C08F8/14; C08L; C08L35/00; C08L35/06; C08L63/00; C08F212/12; C08F2800/00; C08F2800/10; C08F2800/20
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |