Plastic apron endwall for highway underdrain

Description

FIG. 1 is a rear elevational view thereof;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the side opposite being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
1850335 March 1932 Spindler
2334779 November 1943 Luff
3587239 June 1971 Feland
4454039 June 12, 1984 McCoy
4490067 December 25, 1984 Dahowski
5360284 November 1, 1994 Allard
5645367 July 8, 1997 Gunter
Other references
  • Specification for Reinforced Concrete Apron Endwall for Pipe Underdrain by the State of Wisconsin, Department of Transportation, undated.
Patent History
Patent number: D423088
Type: Grant
Filed: Apr 29, 1998
Date of Patent: Apr 18, 2000
Assignee: Midwest Plastic Materials, Inc. (Jefferson, WI)
Inventor: Gary A. Fish (Madison, WI)
Primary Examiner: Alan P. Douglas
Assistant Examiner: Reid Hecker
Law Firm: Lathrop & Clark LLP
Application Number: 0/87,238
Classifications
Current U.S. Class: Gutter (D23/267)
International Classification: 2301;