Patent US3055868A successfully refreshed from Google Patents.
US3055868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly polymeric polymethylene terephthalates
Assignee: Imperial Chemical Industries Ltd
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Filing: 1959-06-01
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Granted: 1962-09-25
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Expires: 1979-06-01
Abstract
No abstract record available.
Inventors
- 👤 Mcintyre James Eric
- 👤 Robertson John Skinner Macnab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:13
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/83; C08G63/85; C08G63/86; C08G63/866
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
UN THE PROCESS OF MANUFACTURE OF FIBER- AND FILMFORMING HIGHLY POLYMERIC POLYMETHYLENE TEREPHALATES WHEREIN A DIALKYL TEREPHTHLATE IS REACTED UNDER ESTER INTERCHANGE CONDITIONS WITH A GYLCOL OF THE SERIES
Claim 2
Dependent Claim
29 words
UN THE PROCESS OF MANUFACTURE OF FIBER- AND FILMFORMING HIGHLY POLYMERIC POLYMETHYLENE TEREPHALATES WHEREIN A DIALKYL TEREPHTHLATE IS REACTED UNDER ESTER INTERCHANGE CONDITIONS WITH A GYLCOL OF THE SERIES
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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |