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. 01, 2004
Filed:
Apr. 01, 2002
Applicant:
Inventor:
Wen-Tsung Chang, Taipei, TW;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A62B 2/302 ; A62B 7/10 ;
U.S. Cl.
CPC ...
A62B 2/302 ; A62B 7/10 ;
Abstract
An improved structure of respirator filter comprised of a laminated layers of fireproof fabric, static fibers, active carbon fibers and non-woven filter cotton; interlaced with airflow guides in among the layers of the filter; a hole or multiple holes being respectively provided at the center or in the peripheral of another airflow guide so to create air conduction for increasing area and time for the gas to contact the filter for improved smoke and toxicity filtration effects.