Patents by Inventor Leon Yeshin

Leon Yeshin 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).

  • Making silicone rubber molds from reclaimed cured silicone rubber particles and liquid uncured silicone rubber
    Patent number: 4006207
    Abstract: The cost of a silicone rubber mould is reduced by making it partly from uncured, liquid, castable, silicone rubber and partly from compatible, reclaimed silicone rubber particles. The latter are treated, e.g., with a swelling agent, to decrease their specific gravity below that of the liquid, silicone rubber. When the two rubbers are amalgamated in a mould having an exposed surface of a master to be reproduced, the particles float away from the surface of the master leaving the liquid, silicone rubber, which is permitted to cure, in contact therewith. After curing the resultant silicone rubber mould is stripped from the master.
    Type: Grant
    Filed: March 26, 1975
    Date of Patent: February 1, 1977
    Assignee: Electrohome Limited
    Inventor: Leon Yeshin