Patent US3567693A successfully refreshed from Google Patents.
US3567693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyester film having improved slip properties
Assignee: Individual
•
Filing: 1968-12-06
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Granted: 1971-03-02
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Expires: 1988-12-06
Abstract
Abstract THE INVENTION RELATES TO A METHOD OF PREPARING A POLYESTER RESIN HAVING FINELY DIVIDED PARTICLES DISPERSED THEREIN BY ADDING A SOLUBLE ALKALINE EARTH METAL COMPOUND AND A FREE DICARBOXYLIC ACID TO A GLYCOL TEREPHTHALATE AND CONDENSING THE GLYCOL ESTER TO FORM HIGH MOLECULAR WEIGHT RESIN. FILMS FORMED FROM THE RESINS HAVE GOOD SLIP PROPERTIES.
Inventors
- 👤 Aleksander Piirma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:37
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08J2367/00; C08J2367/02
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |