Patents by Inventor Richard M. Waterstrat

Richard M. Waterstrat 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).

  • Ductile intermetallic compounds for dental applications
    Patent number: 5019337
    Abstract: Alloys suitable for dental or medical devices are disclosed. A typical alloy comprises about 35 to about 60% by weight of zirconium, about 1 to about 60% by weight of palladium and about 1 to about 60% by weight of ruthenium.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: May 28, 1991
    Assignee: American Dental Association Health Foundation
    Inventor: Richard M. Waterstrat
  • Arc-furnace for the production of small investment castings of reactive or refractory metals such as titanium
    Patent number: 4627482
    Abstract: An arc furnace and investment casting apparatus includes a copper base with an integrally formed crucible having a passage therethrough. A vacuum chamber is positioned on the top of the copper crucible with a non-consumable cathode projecting into the chamber to effect melting of metal placed in the crucible. A vacuum chamber is also suspended beneath the crucible for support of a mold to receive molten metal flowing through the passage.
    Type: Grant
    Filed: February 5, 1985
    Date of Patent: December 9, 1986
    Assignee: American Dental Association Health Foundation
    Inventor: Richard M. Waterstrat
  • Arc furnace for the production of small investment castings of reactive or refractory metals such as titanium
    Patent number: 4538671
    Abstract: An arc furnace and investment casting apparatus includes a copper base with an integrally formed crucible having a passage therethrough. A vacuum chamber is positioned on the top of the copper crucible with a non-consumable cathode projecting into the chamber to effect melting of metal placed in the crucible. A vacuum chamber is also suspended beneath the crucible for support of a mold to receive molten metal flowing through the passage.
    Type: Grant
    Filed: February 7, 1984
    Date of Patent: September 3, 1985
    Assignee: American Dental Association Health Foundation
    Inventor: Richard M. Waterstrat
  • Method for eliminating gamma.sub.2 phase from dental amalgam and improved dental amalgam composition
    Patent number: 4078921
    Abstract: An improved alloy for a dental amalgam includes silver and tin and the additional element, manganese. The alloy is comprised of a minimum of about 60% by weight silver, a maximum of about 20% by weight manganese and the balance tin. Various amounts of other constituents known to those in the art such as gold, copper, zinc and mercury may be included.
    Type: Grant
    Filed: August 12, 1976
    Date of Patent: March 14, 1978
    Assignee: American Dental Association Health Foundation
    Inventor: Richard M. Waterstrat
  • Method for eliminating gamma.sub.2 phase from dental amalgam and improved dental amalgam composition
    Patent number: 4018600
    Abstract: An improved alloy for a dental amalgam includes silver and tin and the additional element, manganese. The alloy is comprised of a minimum of about 60% by weight silver, a maximum of about 15% by weight manganese and the balance tin. Various amounts of other constituents known to those in the art such as gold, copper, zinc and mercury may be included.
    Type: Grant
    Filed: September 29, 1975
    Date of Patent: April 19, 1977
    Assignee: American Dental Association Health Foundation
    Inventor: Richard M. Waterstrat