Back to results
US 3,944,583 AGranted
Bis-phenoxyphthalic acid anhydrides
AssigneeGeneral Electric Company
InventorClayton B. Quinn
Life of this patent
Estimating the term…
Abstract
The invention is concerned with dianhydrides derived from phenolphthalein and from bisphenol fluorenone by a process which can include the reaction of an N-methyl-nitrophthalimide with the dialkali metal salt of either of the aforementioned two dihydroxy compounds.
Claims4
A composition of matter having the formula ##SPC13##
- where Z is a member selected from the class consisting of the ##SPC14##
- group and the ##SPC15##
- group.
A composition having the formula ##SPC16##
A composition having the formula ##SPC17##
A composition having the formula ##SPC18##
Dependencies are inferred from the claim text.