Patents Examined by P. Short
  • Waterproofing material containing bentonite
    Patent number: 4316833
    Abstract: A liquid system containing no water to form an underground waterproof coating material containing a high concentration (70%+) of bentonite (sodium montmorillonite) which is non-hydrated, non-emulsifiable, unexpanded, non-jelled, non-thixotropic but is sufficiently liquid to be applied to a wood, metal or concrete substrate by a caulking gun, trowel or spray method. It can be used over a wide range of temperatures and can be applied to damp surfaces.
    Type: Grant
    Filed: November 5, 1979
    Date of Patent: February 23, 1982
    Inventor: Bryan M. McGroarty
  • Dental cavity varnish composition
    Patent number: 4308062
    Abstract: Dental cavity varnish compositions comprising a solution of nitrocellulose and toluene sulfonamide which wet and precisely conform to each "peak" and "valley" of the extensive microundercuts generated during cavity preparation. The varnish compositions are compatible with composite resin restorative materials.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: December 29, 1981
    Assignee: Pennwalt Corporation
    Inventors: Peter P. L. Cheung, Barry V. Evangelist
  • Anti-sticking composition for coating unvulcanized rubber
    Patent number: 4306994
    Abstract: A dry composition is described which can be converted to an anti-sticking composition for unvulcanized rubber by dispersion in water, consisting essentially of a film forming clay (bentonite or attapulgite), a surfactant and an additive capable of inactivating calcium and magnesium ions (e.g. polyphosphate); optionally, there may be present a defoamer, and up to equal parts by volume, based on a film forming clay, of a filler to speed drying.
    Type: Grant
    Filed: March 27, 1980
    Date of Patent: December 22, 1981
    Assignee: Kalcor Coatings Company, Incorporated
    Inventor: William M. Ellslager