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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 5437818 B1

PDFFull Text
Date of Patent:
Aug. 01, 1995

Filed:

Jun. 23, 1993

Hydrates of the disodium salt or dipotassium salt of

Applicant:
Inventors:

Thomas Ehlis, Freiburg, DE;

Andre Geoffroy, Habsheim, FR;

Erwin Marti, Basel, CH;

Josef Zelger, Riehen, CH;

Karlheinz Franke, Basel, CH;

Andreas Burkhard, Basel, CH;

Assignee:

Ciba-Geigy Corporation, Ardsley, NY (US);

Attorney:

Mansfield; Kevin T.

Primary Examiner:

Jose G Dees

Assistant Examiner:

Joseph M Conrad, III

Int. Cl.
CPC ...
C09K / ; C07C / ;
U.S. Cl.
CPC ...
25230121 ; 562 87 ;
Abstract

The present invention relates to novel hydrates of the disodium salt or dipotassium salt of 4,4'-bis(2-sulfostyryl)biphenyl characterized by their water of hydration content, to the crystal forms associated therewith, characterized by their X-ray diffraction pattern, to processes for the preparation, and to their use for the preparation of concentrated formulations of fluorescent whitening agents.

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Ehlis, Thomas. (1995). Hydrates of the disodium salt or dipotassium salt of (U.S. Patent No. 5437818). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5437818

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