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US3830860A Expired / Lapsed US ⏱️ 0.0 years remaining

Stabilization of norbornenes

Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1973-01-26
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Granted: 1974-08-20
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Expires: 1993-01-26
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Abstract

Abstract A METHOD FOR STABILIZATION OF NORBORNENES WHICH COMPRISES INCORPORATING AT LEAST ONE PHENOL OF EITHER ONE OF THE FORMULAE: 4-((4-(HO-),R3,R4-PHENYL)-X-),R1,R2-PHENOL 2-((2-(HO-),R7,R8-PHENYL)-X''-),R5,R6-PHENOL AND 2-R9,3-R10,4-R11,5-R12,6-R13,7-R14,8-R15-1-NAPHTHOL WHEREIN X AND X'' ARE EACH ALKYLIDENE HVING 1 TO 6 CARBON ATOMS, CYCLOALKYLIDENE HAVING 3 TO 6 CARBON ATOMS, THIO, SULFINYL OR SULFONYL, R1, R2, R3, R4, R5, R6, R7 AND R8 ARE EACH HYDROGEN, ALKYL HAVING 1 TO 9 CARBON ATOMS OR CYCLOALKYL HAVING 3 TO 6 CARBON ATOMS AND R9, R10, R11, R12, R13, R14 AND R15 ARE EACH HYDROGEN, ALKYL HAVEING 1 TO 9 CARBON ATOMS OR PHENYL INTO A NORBORNENE SELECTED FROM THE GROUP CONSISTING OF ALKENYLNORBORNENES AND ALKYLIDENENORBORNENES.

Inventors

  • 👤 T Nagase
  • 👤 F Masuko

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 11:30
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/20

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) 1977-08-19 1978-02-18 1978-08-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-08-19 1982-02-18 1982-08-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-08-19 1986-02-18 1986-08-20 $7700.00 Window Closed / Lapsed

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