US3188369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced plastic
Assignee: Akzona Inc
•
Filing: 1962-02-09
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Granted: 1965-06-08
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Expires: 1982-02-09
Abstract
No abstract record available.
Inventors
- 👤 Roger T Guthrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:53
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/46; B29C70/48; B29K; B29K2223/00; B29K2223/10; B29K2223/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A METHOD OF PRODUCING A FIBER REINFORCED ARTICLE HAVING AN INCREASED IMPACT STRENGTH AND SUPERIOR ELECTRICAL CHARACTERISTICS WHICH COMPRISES DISPOSING A FIBROUS POLYPROPYLENE REINFORCING MATERIAL IN A CONFINED ZONE INTRODUCING A RESIN-FORMING LOW VISCOSITY LIQUID CONSISTING ESSENTIALLY OF STYRENE AND DIVINYLBENZENE INTO THE ZONE AT A CONTROLLED RATE TO INSURE THOROUGH IMPREGNATION OF THE POLYPROPYLENE REINFORCING MATERIAL WITHOUT ENTRAPMENT OF GASES, COPOLYMERIZING THE RESIN-FORMING LIQUID BY INITIALLY HEATING AT LOW TEMPERATURES AND GRADUALLY INCREASING THE TEMPERATURE WHEREBY THE RESIN BEGINS TO GEL BEFORE IT EXERCISES ANY SOLVENT ACTION ON THE POLYPROPYLENE, AND FINALLY SUBJECTING THE MASS TO A CURING TEMPERATURE.
Claim 2
Independent Claim
100 words
A METHOD OF PRODUCING A FIBER REINFORCED ARTICLE HAVING AN INCREASED IMPACT STRENGTH AND SUPERIOR ELECTRICAL CHARACTERISTICS WHICH COMPRISES DISPOSING A FIBROUS POLYPROPYLENE REINFORCING MATERIAL IN A CONFINED ZONE INTRODUCING A RESIN-FORMING LOW VISCOSITY LIQUID CONSISTING ESSENTIALLY OF STYRENE AND DIVINYLBENZENE INTO THE ZONE AT A CONTROLLED RATE TO INSURE THOROUGH IMPREGNATION OF THE POLYPROPYLENE REINFORCING MATERIAL WITHOUT ENTRAPMENT OF GASES, COPOLYMERIZING THE RESIN-FORMING LIQUID BY INITIALLY HEATING AT LOW TEMPERATURES AND GRADUALLY INCREASING THE TEMPERATURE WHEREBY THE RESIN BEGINS TO GEL BEFORE IT EXERCISES ANY SOLVENT ACTION ON THE POLYPROPYLENE, AND FINALLY SUBJECTING THE MASS TO A CURING TEMPERATURE.
References Cited (Backward Citations)
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Cited
US2961364A
Cited
US2903389A
Cited
US2966157A
Cited
GB881899A
Cited
US2987501A
Cited
US3003504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |