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US3684777A Expired / Lapsed US ⏱️ 0.0 years remaining

Novel interpolymers useful as thickening agents

Assignee: EARL P WILLIAMS
•
Filing: 1970-03-20
•
Granted: 1972-08-15
•
Expires: 1990-03-20
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Abstract

Abstract An interpolymer composition comprising: Wherein Y represents -OH and O-R1 and Y and R2 together represent a single bond of an imide ring. X represents either OR -O-. R1 represents the same or different hydrocarbon radicals containing from about C6 to about C36 carbon atoms selected from the group consisting of normal chain alkyl, branched chain alkyl, cycloalkyl and alkylaryl radicals. R2 represents H or the same or different hydrocarbon radicals containing from about C1 to about C30 carbon atoms selected from the group consisting of normal chain alkyl, branched chain alkyl, cycloalkyl, and alkylaryl radicals wherein the sum total of carbon atoms represented by R1 and R2 is not greater than C36 (when X O, or an imide nitrogen,R2 does not exist). R3 represents either hydrogen, methyl, ethyl or phenyl. R4 represents either hydrogen or methyl, which compounds are particularly useful as thickening agents for solutions of high ionic strength.

Inventors

  • 👤 Nathan D Field
  • 👤 Earl P Williams

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 01:03
CPC Classifications
C; C08; C08F; C08F8/00

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 19 words
The interpolymer according to claim 1 wherein R1 represents a hydrocarbon radical having from six to 20 carbon atoms.
Claim 2
Dependent Claim 19 words
The interpolymer according to claim 1 wherein R1 is an alkyl radical having from six to 20 carbon atoms.
Claim 3
Dependent Claim 12 words
The interpolymer according to claim 1 wherein R3 represents a methyl radical.
Claim 4
Dependent Claim 10 words
The interpolymer according to claim 1 wherein X represents nitrogen.
Claim 5
Dependent Claim 10 words
The interpolymer according to claim 1 wherein X represents oxygen.
Claim 6
Dependent Claim 16 words
The interpolymer according to claim 1 wherein R1 is an alkyl radical having 16 carbon atoms.

References Cited (Backward Citations)

US2698316A Cited
US2921930A Cited
US2977334A Cited
US3398092A Cited
US3436378A Cited
US3499876A Cited
US3506625A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-08-15 1976-02-14 1976-08-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-08-15 1980-02-14 1980-08-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-08-15 1984-02-14 1984-08-15 $7700.00 Window Closed / Lapsed

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