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:
Jan. 18, 1977
Filed:
Sep. 20, 1974
Applicant:
Inventors:
Jean-Pierre Lebet, Montreux, CH;
Joel Daniel Ducommun, Chavannes, CH;
Assignee:
Baumgartner Papiers S.A., , CH;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29H / ; B04H / ;
U.S. Cl.
CPC ...
156180 ; 28 / ; 131267 ; 156274 ; 156441 ; 156380 ; 156543 ; 219 1053 ; 219 1081 ; 219 1069 ;
Abstract
A tow of filamentary dielectric material, wrapped in a flexible conveyor belt of low permittivity material such as PTFE, is passed through a stationary tube also of low permittivity material. This tube is disposed in resonating cavities wherein a high frequency electric field of 3.10.sup.8 to 3.10.sup.11 Hz heats the tow. After cooling, the tow forms a tube which may be cut to form cigarette filters.