US2649622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for molding synthetic linear polyesters
Assignee: EIDP Inc
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Filing: 1949-12-20
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Granted: 1953-08-25
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Expires: 1969-12-20
Abstract
No abstract record available.
Inventors
- 👤 Piccard John Augustus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:23
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/003; B29C43/02; B29L; B29L2017/00; B29L2017/001; B29L2017/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PROCESS OF MOLDING ARTICLES FROM THERMOPLASTIC MATERIAL WHICH COMPRISES INTRODUCING A SOLID CRYSTALLIZABLE THERMOPLASTIC MATERIAL CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF SUBSTANTIALLY AMORPHOUS LINEAR POLYETHYLENE TEREPHTHALATE HAVING AN INTRINSIC VISCOSITY OF AT LEAST 0.3, INTO A MOLD AND HEATING THE MATERIAL IN THE MOLD AT A TEMPERATURE OF FROM 120* C. TO 220* C., AND UNDER PRESSURE OF AT LEAST ABOUT 100 POUNDS UNTIL SAID MATERIAL CRYSTALLIZES WHEREBY TO FORM THE DESIRED MOLDED ARTICLE AND THEREAFTER REMOVING SAID ARTICLE FROM THE MOLD BEFORE COOLING.
Claim 2
Dependent Claim
86 words
A PROCESS OF MOLDING ARTICLES FROM THERMOPLASTIC MATERIAL WHICH COMPRISES INTRODUCING A SOLID CRYSTALLIZABLE THERMOPLASTIC MATERIAL CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF SUBSTANTIALLY AMORPHOUS LINEAR POLYETHYLENE TEREPHTHALATE HAVING AN INTRINSIC VISCOSITY OF AT LEAST 0.3, INTO A MOLD AND HEATING THE MATERIAL IN THE MOLD AT A TEMPERATURE OF FROM 120* C. TO 220* C., AND UNDER PRESSURE OF AT LEAST ABOUT 100 POUNDS UNTIL SAID MATERIAL CRYSTALLIZES WHEREBY TO FORM THE DESIRED MOLDED ARTICLE AND THEREAFTER REMOVING SAID ARTICLE FROM THE MOLD BEFORE COOLING.
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) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |