Patents by Inventor Younk Ho Park

Younk Ho Park 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).

  • Patent number: 6090509
    Abstract: Disclosed is a photoconductive solution which has excellent charge characteristics with easy control of charge amount and is completely volatilized after baking. The solution contains 0.01 to 10 wt. % of one of dialkyl(C.sub.n H.sub.2n+1.sup.-) aminobenzil methacrylate(DMABMA) of n below 5, dialkyl(C.sub.n H.sub.2n+1.sup.-) aminophenyl acryloamide(DMAPAA) of n below 5, dialkyl(C.sub.n H.sub.2n+1.sup.-) aminophenyl methacryloamide (DMAPMA) of n below 5, and the mixture of two kinds or more of them as ultraviolet-sensitive material of a donor and an acceptor. The solution is formed by dissolving said one ingredient together with 10 to 20 wt. % of at least one of polystyrene (PS), polymethyl methacrylate(PMMA), polyalphamethylstyrene(PAMS) and polystyrene-oxazoline copolymer(PS-OX) as polymeric binder, in 20 to 85 wt. % of toluene or xylene as solvent.
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: July 18, 2000
    Assignee: Orion Electric Co., Ltd.
    Inventors: Ho Seok Shon, Younk Ho Park