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
Other references
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 |
- 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
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