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US3637798A Expired / Lapsed US ⏱️ 0.0 years remaining

Carboxy 9-dicyanomethylene nitrofluorene

Assignee: Union Carbide Corp
•
Filing: 1968-09-23
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Granted: 1972-01-25
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Expires: 1988-09-23
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Abstract

Abstract FLUORENES HAVE BEEN PREPARED CONTAINING A DIEYANOMETHYLENE GROUP IN THE 9 POSITION. IN ADDITION, THE 2,4,5, AND 7 POSITIONS CONTAIN CARBOXYL, CARBOXYL DERIVATIES, NITRO, OR HYDROGEN SUBSTITUENTS WITH THE PROVISO THAT THERE IS AT LEAST ONE CARBOXYL OR CARBOXYL DERIVATIVE IN ONE OF THESE POSITIONS. THE ELECTRON ACCEPTING PROPERTIES OF THESE COMPOUNDS AND DERIVED POLYMERS MAKE THEM USEFUL FOR TRAPS OR FILTERS FOR ELECTRON-RICH COMPOUNDS AND AS ULTRAVIOLET ABSORBERS. THESE FLUORENE ACCEPTOR MONOMERS AND DERIVED POLYMERS, READILY FORM CHARGE-TRANSFER COMPLEXES WITH A WIDE VARIETY OF P1 OR LEWIS BASES WHICH ARE USEFUL AS COLORING AGENTS, AS ELECTRICAL CONDUCTING MATERIALS AND AS LTRA-VIOLET ASBORBERS.

Inventors

  • 👤 Theodore Sulzberg
  • 👤 Robert J Cotter

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 20:08
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06; C07; C07C; C07C205/00; C07C205/49; C07C205/57; C07C205/61; C08; C08B; C08B3/00; C08G; C08G85/00; C08G85/004; C08K; C08K5/00; C08K5/16; C09B; C09B23/00; C09B23/10; C09B57/00; H; H10; H10K; H10K85/00; H10K85/60; H10K85/615; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/18

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) 1975-01-24 1975-07-26 1976-01-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-01-24 1979-07-26 1980-01-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-01-24 1983-07-26 1984-01-25 $7700.00 Window Closed / Lapsed

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