Patents by Inventor Philip D. Dalsin

Philip D. Dalsin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Production of photopolymerized polyester high index ophthalmic lenses
    Patent number: 6099123
    Abstract: Unsaturated polyester resin-based ophthalmic lens compositions that are modified for unexpected improvement in speed of manufacture while maintaining uniform, low optical distortion and/or improved tint speed by the addition to the polyester composition of at least one photoinitiator, preferably having at least some activity at a wavelength above about 380 nm so that a UV-absorbing compound can be included in the polyester lens composition, and the polyester resin composition is photocured to gelation in about 7 minutes or less, e.g., using a light intensity of at least about 300 microwatts/cm.sup.2, more preferably at least about 500 microwatts/cm.sup.2, most preferably at least about 1,000 microwatts/cm.sup.2.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: August 8, 2000
    Assignee: Signet Armorlite, Inc.
    Inventors: Thomas J. Engardio, Philip D. Dalsin
  • Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability
    Patent number: 5886764
    Abstract: Unsaturated polyester resin-based compositions that are modified for unexpected improvement in uniform, low optical distortion and/or improved tint speed by the addition of one or more additives selected from an allylic ester and/or an acrylic monomer, together with an exotherm depressant, making the modified polyester resin-based composition commercially viable for casting ophthalmic lenses. The additive(s) and exotherm depressant are useful to modify the polyester for sufficient enhancement of optical distortion and/or tint speed such that any unsaturated polyester resin, capable of producing a clear, low color casting, will be improved sufficiently to provide a composition having the required properties for an ophthalmic lens.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: March 23, 1999
    Assignee: Signet Armorlite, Inc.
    Inventors: Thomas J. Engardio, Philip D. Dalsin, Dae Ki Kang, Jean S. Lee
  • Polyester resin-based high index ophthalmic lenses having improved optical unformity and/or tintability
    Patent number: 5852112
    Abstract: Unsaturated polyester resin-based compositions that are modified for unexpected improvement in uniform, low optical distortion and/or improved tint speed by the addition of one or more additives selected from an allylic ester and/or an acrylic monomer, together with an exotherm depressant, making the modified polyester resin-based composition commercially viable for casting ophthalmic lenses. The additive(s) and exotherm depressant are useful to modify the polyester for sufficient enhancement of optical distortion and/or tint speed such that any unsaturated polyester resin, capable of producing a clear, low color casting, will be improved sufficiently to provide a composition having the required properties for an ophthalmic lens.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: December 22, 1998
    Assignee: Signet Armorlite, Inc.
    Inventors: Thomas J. Engardio, Philip D. Dalsin, Dae Ki Kang
  • Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability
    Patent number: 5694195
    Abstract: Unsaturated polyester resin-based compositions that are modified for unexpected improvement in uniform, low optical distortion and/or improved tint speed by the addition of one or more additives selected from an allylic ester and/or an acrylic monomer, together with an exotherm depressant, making the modified polyester resin-based composition commercially viable for casting ophthalmic lenses. The additive(s) and exotherm depressant are useful to modify the polyester for sufficient enhancement of optical distortion and/or tint speed such that any unsaturated polyester resin, capable of producing a clear, low color casting, will be improved sufficiently to provide a composition having the required properties for an ophthalmic lens.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: December 2, 1997
    Assignee: Signet Armorlite, Inc.
    Inventors: Thomas J. Engardio, Philip D. Dalsin, Dae Ki Kang, Jean S. Lee
  • High molecular weight DADMAC polymers by inverse emulsion technology
    Patent number: 4713431
    Abstract: High molecular weight DADMAC polymers are produced by polymerizing an inverse latex of DADMAC with 0.5 to 3 weight percent acrylamide. The polymerization uses a low HLB emulsifier and a free radical initiator.
    Type: Grant
    Filed: November 12, 1986
    Date of Patent: December 15, 1987
    Assignee: Nalco Chemical Company
    Inventors: Bhupati R. Bhattacharyya, Philip D. Dalsin