Concrete tunnel for a rapid transit train

Skip to: Description  ·  Claims  ·  References Cited  · Patent History  ·  Patent History
Description

FIG. 1 is a perspective view of a concrete tunnel for a rapid transit train and showing my new design, with a middle portion broken away to disclose indefinite length; and,

FIG. 2 is an end view thereof.

Claims

The ornamental design of a concrete tunnel for a rapid transit train, as shown and described.

Referenced Cited
U.S. Patent Documents
4993872 February 19, 1991 Lockwood
5252002 October 12, 1993 Day
D454203 March 5, 2002 Bellavance
Other references
  • BEBO Arch System, Zurn Industries, Inc., 1982.
Patent History
Patent number: D490533
Type: Grant
Filed: Jan 24, 2003
Date of Patent: May 25, 2004
Assignee: Con/Span Bridge Systems Ltd. (Dayton, OH)
Inventor: William D. Lockwood (Dayton, OH)
Primary Examiner: Doris Clark
Attorney, Agent or Law Firm: Jacox, Meckstroth & Jenkins
Application Number: 29/174,704
Classifications
Current U.S. Class: Structure (D25/1); With Hollow Core (D25/122)
International Classification: 2503;