The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 1979
Filed:
Jul. 18, 1977
Walter M Hopkins, Glendale, CA (US);
Other;
Abstract
An apparatus having an alternately expanding and contracting chamber comprises at least one pair of cylindrical rollers each having an exterior surface in continuous rolling engagement with the surface of the other roller of the pair, the rollers being rotatable along parallel axes, and two parallel side walls, with each one of the rollers also being in continuous rolling engagement with one of the side walls. A third wall is opposite the rollers and joins the two side walls wherein the chamber is defined between these walls and the pair of rollers, and is enclosed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile