Charles E Wetzel

US Patent:

50191322, May 28, 1991

Filed:

Nov 28, 1989

Appl. No.:

7/442101

Inventors:

Herb Davis - Forked River NJ
Charles R. Wetzel - High Point NC

Assignee:

Ciba-Geigy Corporation - Ardsley NY

International Classification:

C09B 6754
C09B 4501

US Classification:

8527

Abstract:

Stable, concentrated, liquid preparations of 1:2 metal complex azo or azomethine dyes containing at most one sulfonic acid group are obtained by metallizing the metal-free azo or azomethine intermediates in form of their moist, almost salt-free washed, filter cakes with aqueous slurries of complex forming, preferably cobalt or chromium salts. Without isolation of the thus obtained metal complex dyes the dye slurries are then in situ converted into the stable, concentrated dye preparations by adjusting them to a final dye concentration. The dye preparations are produced in a very economic manner by avoiding any isolation of the metal complex dyes after the metallization step and by considerably reducing the amounts of effluents. The dye preparations obtained are suitable for the preparation of dye-baths or printing pastes which may be used in particular for dyeing and printing textile materials made of natural or synthetic polyamide fibres, and further of leather and paper.

US Patent:

54772850, Dec 19, 1995

Filed:

Oct 6, 1993

Appl. No.:

8/132263

Inventors:

Pabitra Datta - West Windsor NJ
Ronald N. Friel - Hamilton Square NJ
Dennis R. McCarthy - Jamison PA
John J. Moscony - Lancaster PA
Eugene S. Poliniak - Willingboro NJ
Peter M. Ritt - East Petersburg PA
Robert E. Simms - Cream Ridge NJ
Carl C. Steinmetz - Mercerville NJ
Harry R. Stork - Adamstown PA
Charles M. Wetzel - Lititz PA

Assignee:

Thomson Consumer Electronics, Inc. - Indianapolis IN

International Classification:

G03B 4100
G03C 500

US Classification:

354 1

Abstract:

In accordance with the present invention, an apparatus for developing a latent image formed on a photoreceptor, which is deposited on an interior surface of an output window of a display device, is disclosed. The developing apparatus includes a developing chamber, having a support surface for supporting the output window, a screen structure material reservoir for storing, deagglomerating and feeding the screen structure material, and a triboelectric gun assembly communicating with the reservoir. The gun assembly triboelectric charges and imparts a desired charge polarity to the screen structure material. The gun assembly further includes at least one material dispersing nozzle spaced from the support surface for distributing the charged material for deposition onto the latent image.