Patents by Inventor Robert Vavrinak

Robert Vavrinak 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).

Torsion spring to aid in keeping an interior door open

Patent number: D801168

Type: Grant

Filed: June 1, 2016

Date of Patent: October 31, 2017

Inventors: Robert Vavrinak, Jacque Vavrinak

Torsion spring to aid in keeping an interior door open