US3729528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyester resins with low shrinkage from polyester resinous compositions containing a reactive filler
Assignee: Hoechst AG
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Filing: 1971-04-21
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Granted: 1973-04-24
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Expires: 1991-04-21
Abstract
Abstract UNSATURATED POLYESTER RESINS ARE HARDENED IN THE PRESENCE OF A REACTIVE FILLER WHICH IS A COTELOMER OF A VINYL AROMATIC COMPOUND, ESPECIALLY STYRENE, AND MALEIC ANHYDRIDE. AS COMPARED WITH THE RESIN CONTAINING NO REACTIVE FILLER THE SHRINKAGE ON HARDENING IS REDUCED. TELOMER STYRENE WHICH WAS USED BEFORE AS THE REACTIVE FILLER CAUSES AN INCREASE IN THE VISCOSITY OF THE RESINS WHICH IS CONSIDERABLY HIGHER THAN THE INCREASE CAUSED BY THE COTELOMERS HEREIN DESCRIBED.
Inventors
- 👤 G Werner
- 👤 D Stahl
- 👤 G Lorentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:04
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06; C08K; C08K3/00; C08K3/01; C08K3/013
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |