Patents by Inventor Robert Schrafft

Robert Schrafft 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).

  • Process for producing a vulcanizable rubber composition with silica-based reinforcing filler
    Patent number: 6136913
    Abstract: In a process for producing a vulcanizable rubber composition containing silica and having a low content of carbon black, at least a silica-based reinforcing filler and ad least a silane-based coupling agent are added to and intimately mixed with other ingredients of the composition in subsequent steps, at a temperature of from 165.degree. and 180.degree. C. and between 110.degree. and 160.degree. C. respectively. The rubber composition so obtained has an improved silica dispersion, constant physico-mechanical characteristics and a better drawability and is particularly suitable for the manufacture of treads for tyres with low rolling resistance.
    Type: Grant
    Filed: February 10, 1999
    Date of Patent: October 24, 2000
    Assignee: Pirelli Coordinamento Pneumatici SPA
    Inventors: Marco Nahmias, Robert Schrafft, Christa Joseph
  • Process for producing a vulcanizable rubber composition with silica-based reinforcing filler
    Patent number: 5916951
    Abstract: In a process for producing a vulcanizable rubber composition containing silica and having a low content of carbon black, at least a silica-based reinforcing filler and ad least a silane-based coupling agent are added to and intimately mixed with other ingredients of the composition in subsequent steps, at a temperature of from 165.degree. and 180.degree. C. and between 1100 and 160.degree. C. respectively. The rubber composition so obtained has an improved silica dispersion, constant physico-mechanical characteristics and a better drawability and is particularly suitable for the manufacture of treads for tires with low rolling resistance.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: June 29, 1999
    Assignee: Pirelli Coordinamento Pneumatici S.p.A.
    Inventors: Marco Nahmias, Robert Schrafft, Christa Joseph
  • Process for producing a vulcanizable rubber composition with silica-based reinforcing filler
    Patent number: 5804636
    Abstract: In a process for producing a vulcanizable rubber composition containing silica and having a low content of carbon black, at least a silica-based reinforcing filler and ad least a silane-based coupling agent are added to and intimately mixed with other ingredients of the composition in subsequent steps, at a temperature of from 165.degree. and 180.degree. C. and between 110.degree. and 160.degree. C. respectively. The rubber composition so obtained has an improved silica dispersion, constant physico-mechanical characteristics and a better drawability and is particularly suitable for the manufacture of treads for tires with low rolling resistance.
    Type: Grant
    Filed: February 26, 1996
    Date of Patent: September 8, 1998
    Assignee: Pirelli Coordinamento Pneumatici S.p.A.
    Inventors: Marco Nahmias, Robert Schrafft, Christa Joseph