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:
May. 06, 1997
Filed:
Nov. 07, 1995
Applicant:
Inventor:
Pao C Pien, Marco Island, FL (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02B / ;
U.S. Cl.
CPC ...
1231934 ;
Abstract
A cylinder body has a bore and an annular recess formed therein. One end of the recess is in communication with the bore and the opposite end of the recess is permanently closed. An inlet and an outlet are in communication with the bore. A piston reciprocates within the bore and has an annular skirt which fits within the annular recess. The skirt compresses air when the skirt moves toward the closed end of the recess to form an annular seal of compressed air between the skirt and the closed end of the recess.