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US3575933A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for preparing benzamide polymers

Assignee: EIDP Inc
•
Filing: 1967-12-28
•
Granted: 1971-04-20
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Expires: 1987-12-28
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Abstract

Abstract (R)N-1,4-PHENYLENE, (R)N-1,3-PHENYLENE, AND BOTH HOMOPOLYMER AND COPOLYMER PREPARATION IS DESCRIBED, INCLUDING SUITABLE SOLVENTS USEFUL FOR POLYMERIZATION AND/OR FOR FORMING SHAPED ARTICLES OF THE POLYMER. SUITABLE BASES, ADDED TO THE REACTION MEDIUM, PROMOTE THE FORMATION OF HIGH VISCOSITY POLYMER. 1,4-PHENYLENE, AND 1,3-PHENYLENE WHEREIN R IS A MONOVALENT RADICAL WHICH IS INERT IN THE POLYMERIZATION REACTION N IS A CARDINAL NUMBER FROM 0 TO 4 AND, Y AND Y'' ARE INDIVIDUALLY SELECTED FROM THE GROUP CONSISTING OF: -Y-CO-NH-Y''- WHEREIN X IS SELECTED FROM THE GROUP CONSISTING OF: O=S=N-X-CO-CL A PROCESS PREPARING BENZAMIDE POLYMERS BY REACTING MONOMERIC AROMATIC THIONYLAMINES OF THE FORMULA:

Inventors

  • 👤 Erhard F Hoegger
  • 👤 John R Schaefgen
  • 👤 Curtis W Stephens

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 19:31
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/12

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) 1974-04-19 1974-10-19 1975-04-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-04-19 1978-10-19 1979-04-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-04-19 1982-10-19 1983-04-20 $7700.00 Window Closed / Lapsed

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