Patent US3137750A successfully refreshed from Google Patents.
US3137750A
Expired / Lapsed
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Injection molding of fabric reinforced plastics
Assignee: Compagnie de Saint Gobain SA
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Filing: 1961-03-10
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Granted: 1964-06-16
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Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
- 👤 Gringras Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:43
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/56; B29C33/00; B29C33/0055; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/46; B29C70/467; B29C70/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A METHOD OF FORMING PLASTIC MATERIAL WITH AN IMPREGNATED REINFORCEMENT WHICH COMPRISES PREPARING A SPACE HAVING BOUNDARIES ESTABLISHING THE FORM OF THE DESIRED ARTICLE, MOUNTING WITHIN SAID SPACE A REINFORCEMENT COMPRISED OF A FABRIC PENETRABLE TO THE PLASTIC MATERIAL, FILLING SAID SPACE AND FABRIC WITH A HARDENABLE PLASTIC MATERIAL BY INJECTING THE PLASTIC MATERIAL INTO THE SPACE UNDER VARYING PRESSURE OF THE PLASTIC, REPEATEDLY AND SUBSTANTIALLY RAISING AND LOWERING THE PRESSURE OF INJECTION DURING THE IMPREGNATION OF THE SAID REINFORCEMENT, AND HARDENING THE REINFORCED ARTICLE.
Claim 2
Independent Claim
85 words
A METHOD OF FORMING PLASTIC MATERIAL WITH AN IMPREGNATED REINFORCEMENT WHICH COMPRISES PREPARING A SPACE HAVING BOUNDARIES ESTABLISHING THE FORM OF THE DESIRED ARTICLE, MOUNTING WITHIN SAID SPACE A REINFORCEMENT COMPRISED OF A FABRIC PENETRABLE TO THE PLASTIC MATERIAL, FILLING SAID SPACE AND FABRIC WITH A HARDENABLE PLASTIC MATERIAL BY INJECTING THE PLASTIC MATERIAL INTO THE SPACE UNDER VARYING PRESSURE OF THE PLASTIC, REPEATEDLY AND SUBSTANTIALLY RAISING AND LOWERING THE PRESSURE OF INJECTION DURING THE IMPREGNATION OF THE SAID REINFORCEMENT, AND HARDENING THE REINFORCED ARTICLE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |