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Patents

Patents that changed the locksmithing industry
From Tyler J. Thomas' Collection:   www.lockreference.com


Combined Lock / Lighting Switch

Walter R. Schlage, 1909 - Patent No. US921168A



Improvement in Locking-Latch

Gilbert J. Dickson, 1875 - Patent No. US166856A



Key Lock

Walter R. Schlage, 1928 - Patent No. 1691529A



Improvement in Locking Latches

E. Skinner, 1875 - Patent No. US158811A



Exchangable Cores

Frank Ellison Best, 1922 - Patent No. US1561771A



Cylindrical Door Lock

Walter R. Schlage, 1923 - Patent No. US1456041A



Cylindrical Lock

Walter R. Schlage, 1928 - Patent No. US1674841A



Escutcheon Plate Fastener

Walter R. Schlage, 1927 - Patent No. US1653513A



Latch Improvements

Walter R. Schlage, 1928 - Patent No. US1691528A