US3732183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filament-forming synthetic linear polyesters modified by sulfonate groups
Assignee: Hoechst AG
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Filing: 1971-09-09
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Granted: 1973-05-08
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Expires: 1991-09-09
Abstract
Abstract FILAMENT-FORMING SYNTHETIC POLYESTERS HAVING A HIGH MOLECULAR WEIGHT AND COMPRISING LINKS IN THE CHAIN OF THE POLYMER MOLECULE WHICH CONTAIN SULFONATE GROUPS. THESE CHAIN LINKS CCONTAINING SULFONATE GROUPS HAVE THE GENERAL FORMULAE ((-)OOC)2-C6H3-SO3(-) (P(-C6H5)3-R)(+), OR -OOC-C6H4- SO3(-) (P(-C6H5)3-R)(+) IN WHICH R STANDS FOR AN ALKYL RADICAL, FOR EXAMPLE, CH3, CH2H5, N-CH3H7, N-CH4H9, OR THE 3-SODIUM (SULFOPROPYL) RADICAL, OR THE 4-SODIUM (SULFO-BUTYL) RADICAL AND ARE CONTAINED IN THE POLYMER IN AN AMOUNT OF FROM 0.5 TO 5 MOL PERCENT, CALCULLATED ON THE POLYMER UNIT CONSISTING OF DICARBOXYLIC ACID RADICAL AND DIOL RADICAL.
Inventors
- 👤 J Popp
- 👤 L Wappes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:57
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/692; C08G63/6924; C08G63/6926; Y; Y10; Y10S; Y10S8/00; Y10S8/04
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |