US3222299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of reclaiming linear terephthalate polyester
Assignee: EIDP Inc
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Filing: 1961-10-16
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Granted: 1965-12-07
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Expires: 1981-10-16
Abstract
No abstract record available.
Inventors
- 👤 John T Macdowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:41
CPC Classifications
C; C08; C08J; C08J11/00; C08G; C08G63/00; C08G63/78; C08G63/785; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
65 words
THE PROCESS OF RECLAIMING SCRAP LINEAR TEREPHTHALATE POLYESTER WHICH COMPRISES HEATING THE SAID SCRAP WITH A GLYCOL, MIXING THE RESULTING DIGLYCOL TEREPHTHALATE ESTER WITH A DIGLYCOL TEREPHTHALATE ESTER PREPARED FROM PURIFIED STARTING MATERIALS AND THEREAFTER POLYMERIZING THE MIXTURE UNDER CONDITIONS OF REDUCED PRESSURE AND ELEVATED TEMPERATURE IN THE PRESENCE OF A MINOR AMOUNT OF A METAL SALT OF AN AROMATIC ESTER-FORMING COMPOUND HAVING THE FORMULA
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |