Patents Assigned to O
  • Check valve having temperature response
    Patent number: 3930613
    Abstract: A thermally sensitive check valve is disclosed in which a bimetallic snap disc functions in one position as the check valve element and in another position to either maintain the valve open as in one illustrated embodiment, or to maintain the valve closed as illustrated in another embodiment. By combining the check valve function and the valving function in a single bimetallic snap disc, a simple and reliable device is provided.
    Type: Grant
    Filed: October 18, 1974
    Date of Patent: January 6, 1976
    Assignee: Therm-O-Disc Incorporated
    Inventor: Donald E. Place
  • Replication processes for producing plastic optical components
    Patent number: 3931373
    Abstract: Polymeric replica molds formed from certain specific polymeric compositions are disclosed. The polymeric compositions impart properties to the replica molds which allow the casting of high-quality plastic optical components such as ophthalmic lenses.Among the polymeric compositions which have been found useful are: (1) cross-linked polymethyl methacrylate; (2) a copolymer of 99-20 parts methyl methacrylate and 1-80 parts acrylonitrile, preferably but not necessarily cross-linked; (3) cross-linked polystyrene; (4) a cross-linked copolymer of 90-10 parts styrene and 10-90 parts acrylonitrile; and, (5) a cross-linked copolymer of 90-10 parts styrene and 10-90 parts methyl methacrylate.Replication processes including the steps of forming the polymeric replica molds described herein and subsequently using them in the casting of plastic lenses from materials such as polymerized allyl diglycol carbonate are also disclosed.
    Type: Grant
    Filed: April 15, 1974
    Date of Patent: January 6, 1976
    Assignee: J. O. Beattie Research Company
    Inventor: John O. Beattie
  • Beer can structure
    Patent number: 3930592
    Abstract: A can structure suitable for packaging beer or the like includes an indicator formed integral with one end wall. The indicator provides visual, tactile and audible indication of the quality of the product in the can. Various specific indicator structures are disclosed.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: January 6, 1976
    Assignee: Carling O'Keefe Limited
    Inventor: Daniel DiIanni
  • Game racket and stringing means therefor
    Patent number: 3930648
    Abstract: A game racket with a metallic frame having a head formed with an external opening groove to receive a stringer strip of suitable flexible material that is positionable within the groove of the head frame so as to protect the strings forming the playing surface of the racket from contact with the metallic frame, and stringer strip retaining tabs in position between the stringer strip and the surfaces of the groove to resist removal of the stringer strip from the groove.
    Type: Grant
    Filed: September 26, 1974
    Date of Patent: January 6, 1976
    Assignee: A-T-O Inc.
    Inventor: Thomas E. Brown