Patents Examined by Michael Lusignal
  • Patent number: 5208077
    Abstract: A composite material, particularly useful for prestressing concrete and in stay cables for cable-stayed bridges and other such uses where strength, corrosion resistance and resistance to fatigue failure are particularly important, comprises high strength wire strand coated and impregnated with an impermeable and strongly adherent epoxy based resin. The impregnated and coated epoxy increases the flexural stiffness of the composite against bending fatigue in the areas of the anchorages in dynamically loaded situations and reduces relative movement and rubbing of the wires of the strand so as to reduce fretting and hence fretting fatigue, the principal mechanism for failure in dynamically loaded strand.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: May 4, 1993
    Assignee: Florida Wire and Cable Company
    Inventors: Dale D. Proctor, Denny M. Bucy, R. Terry Johnson, Michael R. Bradley
  • Patent number: 4828890
    Abstract: The present invention is a method of preserving plants which achieves reduced bleeding of the preservative material when the plants are subjected to elevated humidity conditions. The method comprises perfusing the plants with an aqueous preservative composition in which the preservative is primarily an alkylene oxide oligomer, 1,3-butanediol, or 1,4-butanediol. Preferred alkylene oxide oligomers are di- and polyethylene glycols in the molecular weight range of about 200-1500 and di- and polypropylene glycols with an average molecular weight below about 450. The preferred materials may be used with lesser amounts of secondary humectant materials selected from glycerol, ethylene glycol, propylene glycol, magnesium chloride or magnesium bromide hexahydrate, and water soluble cycle phosphonate esters. Plants are conventionally treated by perfusing an aqeous treatment solution into the vascular system through a cut stem or other incision which exposes the xylem.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: May 9, 1989
    Assignee: Weyerhaeuser Company
    Inventors: George T. Tiedeman, David W. Park, Robert H. Young