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:
Nov. 05, 1991
Filed:
Nov. 13, 1989
Thomas P Foley, Stony Brook, NY (US);
Roger Mosciatti, Coram, NY (US);
MFM Technology, Inc., Ronkonkoma, NY (US);
Abstract
A vacuum chuck apparatus includes a vacuum chuck mounted on one end of a hollow shaft whose other end is connected through a rotary seal to a vacuum source. The seal includes a first member having a cap portion cemented to the shaft end and an axially bored frustoconical projection on its end wall and a second member having a frustoconical socket complementing the projection which partially nests in the socket. The second member has a radial pin loosely engaging a longitudinal slot in a stationary bracket to restrict its rotation and permit its axial movement. A spring loaded pressure plate bears on the outer end face of the seal second member.