Patent US2784648A successfully refreshed from Google Patents.
Patent US3679349A successfully refreshed from Google Patents.
US3679349A
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US
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Removal of polyester oligomers with chlorofluoroalkanes and methylene chloride treatment of polyester fibers
Assignee: Hoechst AG
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Filing: 1971-01-18
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Granted: 1972-07-25
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Expires: 1991-01-18
Abstract
Abstract PROCESS FOR THE IMPROVEMENT OF THE PROCESSING AND DYEING PROPERTIES OF TEXTILE MATERIALS CONSISTING OF OR CONTAINING HIGH MOLECULAR POLYESTERS BY TREATING THESE MATERIALS WITH A SOLVENT MIXTURE OF HALOGENATED METHANE OR ETHANE DERIVATIVES OF THE GENERAL FORMULA R-F IN WHICH R REPRESENTS A RADICAL OF THE FORMULA FCL2C-CFCL- OR CL3C-, AND METHYLENE CHLORIDE, CONTAINING BOTH THE COMPONENTS IN A WEIGHT RATIO OF FROM 30:70 TO 70:30, PREFERABLY OF FROM 45:55 TO 55:45.
Inventors
- 👤 Hans-Ulrich Von Der Eltz
- 👤 Walter Birke
- 👤 Wolfgang Kunze
- 👤 Franz Schon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:16
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/08; C; C08; C08G; C08G63/00; C08G63/88; C08G63/90; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/651; D06P1/6515; D06P1/65156; D06P1/90; D06P1/92; D06P1/922; D06P1/924; D06P3/00; D06P3/34; D06P3/52; D06P3/54; D06P5/00; D06P5/02; D06P5/04; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/922
Claims Analysis
Total Claims: 0
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |