05000339 is referenced by 19 patents and cites 6 patents.

A flip-top replacement gas cap for replacing conventional screw-on caps provided as original equipment with present day motor vehicles. Two embodiments of the invention are disclosed. The first is a manually actuated device. The second is a key actuated device. In both embodiments pressure relief valves are included to vent over-pressure within the gas tank and to bleed off pressure prior to opening of the flip-top cap. The key actuated embodiment includes a rachet cam assembly which permits the cap to be screw fastened to a motor vehicle gas filler vent but precludes the unscrewing of the cap thereafter. "Gas cap" is used herein as a generic descriptor for any closure cap used to seal a filler tube of a fuel tank or any other storage vessel.

Title
Flip-top gas cap
Application Number
7/415633
Publication Number
5000339
Application Date
October 2, 1989
Publication Date
March 19, 1991
Inventor
William Thornton
1224 E. Evergreen, Apt. 113, Mesa, 85203
AZ, US
Richard Wheat
2151 N. Meridian Rd., #22, Apache Junction, 85220
AZ, US
Agent
James F Duffy
IPC
B65D 51/16
View Original Source