US3423370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film and fiber forming copolyesters
Assignee: Kalle GmbH and Co KG
•
Filing: 1964-09-10
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Granted: 1969-01-21
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Expires: 1984-09-10
Abstract
No abstract record available.
Inventors
- 👤 Herbert Fitz
- 👤 Walter Seifried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:42
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G63/78; C08G63/82; C08J; C08J5/00; C08J5/18; D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F6/78; D01F6/84; D01F6/86
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A FILM AND FIBER FORMING COPOLYESTER OF HIGH MOLECULAR WEIGHT WHICH IS THE POLYCONDENSATION PRODUCT OF A MIXTURE CONSISTING ESSENTIALLY OF TEREPHTHALIC ACID OR AN ALKYL ESTER THEREOF WITH A POLYMETHYLENEGLYCOL AND AN ALIPHATIC DIOL ETHER OF THE FORMULA
Claim 2
Dependent Claim
39 words
A FILM AND FIBER FORMING COPOLYESTER OF HIGH MOLECULAR WEIGHT WHICH IS THE POLYCONDENSATION PRODUCT OF A MIXTURE CONSISTING ESSENTIALLY OF TEREPHTHALIC ACID OR AN ALKYL ESTER THEREOF WITH A POLYMETHYLENEGLYCOL AND AN ALIPHATIC DIOL ETHER OF 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) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |