Patent US3201506A successfully refreshed from Google Patents.
US3201506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Addition of magnesium silicate to a polyester in the manufacture of oriented film
Assignee: EIDP Inc
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Filing: 1962-08-09
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Granted: 1965-08-17
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Expires: 1982-08-09
Abstract
No abstract record available.
Inventors
- 👤 Bills William Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:18
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
IN A PROCES OF PREPARING A POLYMERIC LINEAR TEREPHTHALATE ESTER FILM WHEREIN AN ALKYLE ESTER OF TEREPHTHALIC ACID HAVIG FROM 1 THROUGH 7 CARBON ATOMS IN THE ALKYL GROUP IS REACTED WITH A POLYMETHYLENE GLYCOL HAVING FROM 2 THROUGH 10 CARBON ATOMS UNDER CONDITIONS WHEREBY ESTER INTERCHANGE IS EFFECTED, THE ESTER IS SUBSEQUENTLY POLYMERIZED, EXTRUDED INTO THE FORM OF A THIN FILM AND THE FILM MOLECULARLY ORIENTED BY ELONGATING SAID FILM IN BOTH THE LONGITUDINAL AND TRANSVERSE DIRECTIONS TO AN EXTENT OF AT LEAST 2.0 TIMES ITS ORIGINAL DIMENSIONS WHILE BEING HEATED TO A TEMPERATURE WITHIN THE RANGE OF 80 TO 160*C., THE IMPROVEMENT COMRISING: ADDING TO SAID ESTER PRIOR TO POLYMERIZATION FROM 1 THROUGH 5% BY WEIGHT BASED ON THEWEIGHT OF SAID ALKYL ESTER OF TEREPHTHALIC ACID, OF HYDRATED MAGNESIUM SILICATE HAVING PARTICLE SIZES WITHIN THE RANGE OF 2 TO 10 MICRONS.
Claim 2
Dependent Claim
143 words
IN A PROCES OF PREPARING A POLYMERIC LINEAR TEREPHTHALATE ESTER FILM WHEREIN AN ALKYLE ESTER OF TEREPHTHALIC ACID HAVIG FROM 1 THROUGH 7 CARBON ATOMS IN THE ALKYL GROUP IS REACTED WITH A POLYMETHYLENE GLYCOL HAVING FROM 2 THROUGH 10 CARBON ATOMS UNDER CONDITIONS WHEREBY ESTER INTERCHANGE IS EFFECTED, THE ESTER IS SUBSEQUENTLY POLYMERIZED, EXTRUDED INTO THE FORM OF A THIN FILM AND THE FILM MOLECULARLY ORIENTED BY ELONGATING SAID FILM IN BOTH THE LONGITUDINAL AND TRANSVERSE DIRECTIONS TO AN EXTENT OF AT LEAST 2.0 TIMES ITS ORIGINAL DIMENSIONS WHILE BEING HEATED TO A TEMPERATURE WITHIN THE RANGE OF 80 TO 160*C., THE IMPROVEMENT COMRISING: ADDING TO SAID ESTER PRIOR TO POLYMERIZATION FROM 1 THROUGH 5% BY WEIGHT BASED ON THEWEIGHT OF SAID ALKYL ESTER OF TEREPHTHALIC ACID, OF HYDRATED MAGNESIUM SILICATE HAVING PARTICLE SIZES WITHIN THE RANGE OF 2 TO 10 MICRONS.
References Cited (Backward Citations)
US3002942A
Cited
US2995779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |