US3558557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters,their production and uses
Assignee: Sandoz AG
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Filing: 1967-10-06
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Granted: 1971-01-26
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Expires: 1987-10-06
Abstract
Abstract THE INVENTION RELATES TO THERMOPLASTIC COPOLYESTERS COMPOSED OF THE RADICALS OF AROMATIC DICARBOXYLIC ACIDS (A), ALIPHATIC OR ALICYCLIC DIOLES (B), T HE OXALKYLATION PRODUCTS OF COMPOUNDS HAVING TWO PHENOLIC HYDROXYL GROUPS IN THE MOLECULE (C) AND COMPOUNDS WITH MORE THAN TWO CARBOXYLIC ACID GROUPS OR ALIPHATIC HYDROXYL GROUPS IN THE MOLECULE (D), WHICH ARE HIGHLY SUITABLE FOR THE MANUFACTURE OF FIBRES, FILAMENTS, FILMS OR MOULDED PRODUCTS.
Inventors
- 👤 Josef Hrach
- 👤 Winfried Zeschmar
- 👤 Gottfried Morawetz
- 👤 Dominik Mach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:25
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G63/02; C08G63/12; C08G63/16; C08G63/20
Claims Analysis
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |