Changeable display mechanisms

• US 2,754,605 A
• Filed: 12/24/1949
• Issued: 07/17/1956
• Est. Priority Date: 12/24/1949
• Status: Expired due to Term

• Current Assignee: Arnold D. Berkeley
• Original Assignee: Arnold D. Berkeley
• Inventors: Berkeley, Arnold D.
• Application Number:
  US03/134,893
• Time in Patent Office: 2,397 Days
• US Class Current: 40/471
• CPC Class Codes: G09F 11/29 of a band other than endless
• CPC Class Codes: G09F 13/34 with light sources co-operating with movable members, e.g. with shutters to cover or uncover the light source apparatus wherein advertising or display material is moved in a continuous or intermittent succession G09F11/00; construction or details of lighting devices F21V11/00
• CPC Class Codes: G09F 2011/0054 using a support in the form of an envelope

Claims