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:
Jun. 18, 1996
Filed:
Mar. 17, 1994
Applicant:
Inventors:
Charles E Mulcahey, Beverly, MA (US);
Michael R Porter, Topsfield, MA (US);
John J Kirby, South Hamilton, MA (US);
Assignee:
Porter Sewing Machines, Inc., Beverly, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D05B / ;
U.S. Cl.
CPC ...
11247501 ; 11247508 ; 112314 ;
Abstract
A method for forming a partial mattress sack which prevents radial bunching includes feeding first and second panels having different edge lengths at different rates through a sewing machine to form the partial mattress sack. An apparatus for sewing the partial mattress sack includes a mechanism for driving upper and lower walking feet at varying rates and a mechanism for driving the upper walking foot at the same speed as a second lower walking foot.