Owen J. Roberts

“ While Gullborg's invention was confined to an improvement in the hose coupler, which is but one element in the old and well understood combination of a compression chamber or pump, a hose, a hose-coupler, and a grease cup or fitting connected to the bearing to be lubricated, his claims are not for the improvement as such but all are for a combination of the old elements with the improved form of coupler. They are too long to set forth in full. ”

“ The petitioner does not contest the holdings. The second gun sold by the respondent combines a receptacle containing grease under a pneumatic pressure of about one hundred pounds, the exit of which is connected to a pipe discharging into the chamber of a plunger-operated pump and a hose attached at the base of the pump chamber terminating in a coupling device like that of the Gullborg patent. The method of operation is that when the plunger is retracted beyond the orifice of the supply pipe grease is forced into the pump chamber by the air pressure in the receptacle. ”

“ We are of the opinion that the owner of the patents cannot extend the monopoly of its patent for a pin fitting to preclude the use therewith of any grease gun not embodying the improvement in the coupling device evidenced by the patent in suit; and cannot extend the monopoly of the combination patent in suit to prevent the use of a pin fitting which does not infringe the fitting patent, 1,307,733, with a gun having a coupler such as that claimed in the patent in suit. ”