William Burnham Woods

“ But if the sash lock of the appellees is held to infringe the Voll and McGregor patent, it beyond question or controversy includes the separate device of Voll for which he made application for letters-patent. The only ground upon which the appellees' sash lock can be held to embody any part of the device of either, is that the catch to prevent the sidewise motion of the locking lever is on the base plate and not on the striking plate. ”

“ A pivoted latch on the end of the locking lever with a downward projection entering a socket in the base plate to prevent a lateral movementof the locking lever does not appear to us to be the equivalent of either the contrivance of Voll or of Voll and McGregor. The difference between them is as clear and distinct as the difference between a door latch and a door bolt. ”