US 9,809,111 B1
Anti-siphon device
Samuel J. Dana, Princeton, ME (US)
Filed by Samuel J. Dana, Princeton, ME (US)
Filed on Nov. 22, 2016, as Appl. No. 15/359,267.
Int. Cl. B65D 3/00 (2006.01); B60K 15/04 (2006.01); B65D 88/54 (2006.01)
CPC B60K 15/0403 (2013.01) [B65D 88/54 (2013.01); B60K 2015/047 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An anti-siphon device, said device configured to be located within a fuel filler pipe, said fuel filler pipe having a proximate section with an opening suitable for receiving fuel, a distal section with an opening in communication with a fuel tank, and an intermediate section having a length and interposed between and connected to the proximate section of said fuel filler pipe and the distal section of said fuel filler pipe, with the intermediate section of said fuel filler pipe oriented at a first angle to the proximate section of said fuel filler pipe and the intermediate section of said fuel filler pipe oriented at a second angle to the distal section of said fuel filler pipe, with a first distance being a longest straight line distance from the proximate section of said fuel filler pipe to the intermediate section of said fuel filler pipe, and a second distance being a longest straight line distance from the distal section of said fuel filler pipe to the intermediate section of said fuel filler pipe, said anti-siphon device comprising
a substantially rigid body member, said body member having a length, an outside diameter, a proximate end, a distal end, and a hollow interior,
with the length of said body member being less than the length of the intermediate section of the fuel filler pipe, greater than the first distance, and greater than the second distance,
an outside diameter of said body member being less than an inside diameter of the intermediate section of the fuel filler pipe,
the proximate end of said body member being substantially open to allow fuel to enter into the hollow interior of said body member, and
the distal end of said body member being partially open to allow fuel to exit from the hollow interior of said body member; and
a restriction element located at the distal end of said body member, said restriction element having one or more apertures, each of said apertures being sufficiently large to permit fuel to pass therethrough and sufficiently small to prevent a siphon hose from passing therethrough;
whereby the device is placed within the intermediate section of the fuel filler pipe with the proximate end of the body member oriented towards the proximate section of the fuel filler pipe and the distal end of the body member oriented towards the distal section of the fuel filler pipe, wherein fuel introduced into said fuel filler pipe through the opening of the proximate section of said fuel filler pipe flows through the proximate section of said fuel filler pipe, through the intermediate section of said fuel filler pipe, through the device, through the distal section of said fuel filler pipe, and through the opening of the distal section of said fuel filler pipe into the fuel tank.