Peter G Piusz

41705670, Oct 9, 1979

May 12, 1977

5/796213

Nori Y. C. Chu - Southbridge MA
Peter G. Piusz - Brimfield MA

American Optical Corporation - Southbridge MA

G02B 523
C09B 4500

252300

Light fatigue resistant, non-orange, photochromic mercury complexes of asymmetrical diarylthiocarbazones for use in making photochromic sunglass lenses, ski goggles, and the like. The compounds comprise the class of mono and bis mercury diarylthiocarbazonates wherein one aryl group is an aryl group substituted at the ortho position with an electron withdrawing group such as CF. sub. 3 and the other aryl group is different from the first and can comprise variously substituted or unsubstituted phenyl or naphthyl groups.

40495671, Sep 20, 1977

Mar 17, 1976

5/667686

Nori Y. C. Chu - Southbridge MA
Peter G. Piusz - Longmeadow MA

American Optical Corporation - Southbridge MA

G03C 102

252300

Photochromic plastic materials are disclosed which comprise a polymeric matrix containing a multiplicity of activated silver halide particles less than 1000 Angstroms in size. The matrix may contain a retained amount of plasticizer which optimizes the desirable photochromic properties and may be sealed to prevent loss of plasticizer. The materials are made by forming activated silver halide particles in the presence of a film forming polymer dissolved in a plasticizer and removing the plasticizer to produce a supple, shape-retaining element.

42150108, Jul 29, 1980

Sep 8, 1978

5/940535

Richard J. Hovey - Sturbridge MA
Nori Y. C. Chu - Southbridge MA
Peter G. Piusz - Longmeadow MA
Charles H. Fuchsman - Bemidji MN

American Optical Corporation - Southbridge MA

G02B 523
G02B 104
C07D26538

252300

Photochromic compounds of the formula ##STR1## wherein one of R. sub. 1 and R. sub. 2 is halogen or lower alkoxy, and the other is hydrogen, and R. sub. 3 and R. sub. 4 are hydrogen, lower alkyl, lower alkoxy, or halogen and their use in lenses are disclosed.

43426689, Aug 3, 1982

Jul 28, 1980

6/172910

Richard J. Hovey - Sturbridge MA
Nori Y. C. Chu - Southbridge MA
Peter G. Piusz - Brimfield MA
Charles H. Fuchsman - Bemidji MN

American Optical Corporation - Southbridge MA

G02B 523
G02B 104
C07D26538

252586

Photochromic compounds of the formula ##STR1## wherein one of R. sub. 1 and R. sub. 2 is halogen or lower alkoxy, and the other is hydrogen, R. sub. 3 and R. sub. 4 are hydrogen, lower alkyl, lower alkoxy, or halogen and R. sub. 5 is an alkyl of 2 to 10 carbons, and their use in lenses are disclosed.