Patents by Inventor Karl J. Siegenthaler

Karl J. Siegenthaler 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: 4877468
    Abstract: A hot tire forming method whereby at least some of the elements constituting each tire are formed starting from respective masterbatches, which are mixed with given chemical compounds inside respective continuous mixers to obtain respective final mixes, which are hot-fed to respective continuous production means, such as extruders, for obtaining semifinished products, which are hot-fed onto a green tire building drum, with the completed green tire then being transferred, hot, to a curing department; the transfer from the continuous mixers to the curing department being performed in such a manner as to preserve, inside each green tire entering the curing department, at least part of the initial mixing thermal energy and at least part of the initial continuous production thermal energy.
    Type: Grant
    Filed: May 18, 1987
    Date of Patent: October 31, 1989
    Assignee: The Firestone Tire & Rubber Company
    Inventor: Karl J. Siegenthaler
  • Patent number: 4747765
    Abstract: A mobile tire curing unit having top and bottom mold halves interconnectable in releasable manner so as to define an annular chamber for receiving a green tire, with one of the mold halves incorporating a closed circuit for a given curing media supply under pressure, the circuit being defined by a deformable curing bladder, designed to occupy the annular chamber, and by a casing connectd to the inner tube by a heated supply duct and a return duct; the casing also housing a powered fan for circulating the curing media inside the closed circuit, and the circuit being externally chargeable via an inlet valve.
    Type: Grant
    Filed: May 18, 1987
    Date of Patent: May 31, 1988
    Assignee: The Firestone Tire & Rubber Company
    Inventors: Karl J. Siegenthaler, Robert Schlemmer
  • Patent number: 4728274
    Abstract: A tire curing apparatus in which a number of mobile curing units, each designed to house a respective green tire, are selectively and independently fed along a loop circuit having at least two parallel branches, the ends of which branches are connected to a common section extending through a station for loading and unloading tires on and off respective curing units; each curing unit incorporating a mold for a respective green tire, a closed pneumatic circuit designed to receive, at the loading/unloading station, a given supply of curing medium under pressure, a fan device for force circulating the curing medium supply inside the pneumatic circuit, and individual elements for heating both the mold and the curing medium supply.
    Type: Grant
    Filed: May 18, 1987
    Date of Patent: March 1, 1988
    Assignee: The Firestone Tire & Rubber Company
    Inventor: Karl J. Siegenthaler