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. 21, 2003
Filed:
May. 25, 2001
Applicant:
Inventor:
Ugo Gussalli Beretta, Brescia, IT;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F41A 5/18 ;
U.S. Cl.
CPC ...
F41A 5/18 ;
Abstract
This is a gas-flow device for semiautomatic or automatic shotguns, which consists of a gas-flow cylinder, closed at the front part by a flange with gas discharge ports ( ) around the ammunition magazine, opposite the cylinder, a circular valve ( ) that moves axially for controlled opening and closing of the discharge ports. The valve is kept in the closed position by a pre-stressed spring ( ) and it moves to the open position when the gas pressure in the expansion chamber increases beyond a set value.