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US3684776A 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 Interpolymers consisting essentially of the structural units in anhydride form: WHEREIN X represents -O-; Y represents -OH, -OR1, and when Y and R2 are taken together represent a single bond of an imide ring; R1 and R2 represent hydrogen or the same or different hydrocarbon radicals having from one to 50 carbon atoms and together contain a total of from six to 50 carbon atoms selected from the group consisting of normal chain alkyl, branched chain alkyl, cycloalkyl, and alkylaryl radicals; (WHERE X -O-, R2 does not exist); R3 represents the same or different hydrocarbon radicals selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and CH2CH2O)q(CH2)mCH3 radicals wherein q represents an integer of from about 1 to about 3 and m represents an integer of from about 0 to about 3.

Inventors

  • 👤 Nathan D Field
  • 👤 Earl P Williams

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 15:30
CPC Classifications
C; C08; C08F; C08F8/00; Y; Y10; Y10S; Y10S424/00; Y10S424/02

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 18 words
The interpolymer of claim 1 wherein R1 is an alkyl radical having from six to 20 carbon atoms.
Claim 2
Dependent Claim 9 words
The interpolymer of claim 1 wherein X represents oxygen.
Claim 3
Dependent Claim 9 words
The interpolymer of claim 1 wherein X represents nitrogen.
Claim 4
Dependent Claim 11 words
The interpolymer of claim 1 wherein R3 represents a methyl radical.

References Cited (Backward Citations)

US2698316A Cited
US2866772A Cited
US2985625A Cited
US2977334A Cited
US3398092A 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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