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US3836552A Expired / Lapsed US ⏱️ 0.0 years remaining

Derivatives of perfluorated carboxylic acids

Assignee: Hoechst AG
•
Filing: 1972-05-31
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Granted: 1974-09-17
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Expires: 1992-05-31
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Abstract

Abstract RT-CONH-(CH2)3-N(CH2CH2O)NH)2(R)X&, IN WHICH N IS A NUMBER FROM 1 TO 4, Z IS 1 OR 2, R REPRESENTS A LOWER ALKYL GROUP AND X- IS A HALOGEN SULFATE OR METHOSULFATE ANION, AND PROCESS FOR PREPARING THESE COMPOUNDS, WHEREIN PERFLUORO-ALKANE-CARBOXYLIC ACID ALKYL ESTERS, ARE REACTED WITH 1-(N,N-DIETHANOL)-3AMINO-PROPANE AND , DEPENDING ON THE COMPOUND, SUBSEQUENTLY OXETHYLATED, ESTERIFIED AND/OR QUATERNIZED. THE NEW COMPOUNDS STRONGLY REDUCE THE SURFACE TENSION OF AQUEOUS SOLUTIONS. THEY HAVE AN EXCELLENT WETTING POWER AND MAY ALSO BE USED AS EMULSIFIERS FOR FLUORO-HYROCARBON/WATER EMULSIONS. SURFACE-ACTIVE PERFLUORATED ALKANE-CARBOXYLIC ACIDAMIDE-AMINE DERIVATIVES AND THEIR QUATERNIZATION PRODUCTS OF THE FORMULAE D R A W I N G RT-CONH-(CH2)3-N(CH2CH2O)NH)2)(CH2)5C O O&), RT-CONH-(CH2)3-N(CH2CH2O)NH)2,

Inventors

  • 👤 H Brecht
  • 👤 H Stach
  • 👤 D Hoffmann

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 13:34
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/004; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07

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) 1977-09-16 1978-03-18 1978-09-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-09-16 1982-03-18 1982-09-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-09-16 1986-03-18 1986-09-17 $7700.00 Window Closed / Lapsed

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