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:
Aug. 31, 1993
Filed:
May. 17, 1991
Thomas J Bachinski, Minnetonka, MN (US);
Donaldson Company, Inc., Minneapolis, MN (US);
Abstract
A pleatable filter media, suitable for a use in a respirator for humans, is disclosed comprising a filter material including a meltblown polymeric material, such as polypropylene. A laminate construction is disclosed for the filter material comprising a plurality of layers of the meltblown polypropylene laminated together with adhesive. The filter media is preferably glassless. Protective layers enclose the layers of meltblown polypropylene. Methods of manufacture of pleated material are disclosed wherein the adhesive between the layers is extruded in a particular pattern to provide increased stiffness in the machine direction of the pleated filter media. Methods of manufacture are also disclosed wherein the filter media is pleated before the adhesive has cured, and the adhesive is then permitted to cure while the filter media is maintained in the pleated state. Methods of manufacture are also disclosed wherein the filter media is heated, and possibly compressed, after pleating to help form stiffer pleats and sharper pleat tips.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile