Underground conduit

- LOF Plastics Inc.
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Description

FIG. 1 is a perspective view of an underground conduit showing our new design, the center thereof shown broken-away to indicate indeterminate length;

FIG. 2 is a front elevational view thereof;

FIG. 3 is an end elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D175586 September 1955 Cataldo
220765 October 1879 Linford
3004330 October 1961 Wilkins
4137424 January 30, 1979 Hesse et al.
4454692 June 19, 1984 Ault
4479687 October 30, 1984 Humphreys et al.
Other references
  • Sunlight Plastics Extrusions brochure, Item A, p. 1.
Patent History
Patent number: D285192
Type: Grant
Filed: Dec 5, 1983
Date of Patent: Aug 19, 1986
Assignee: LOF Plastics Inc. (Troy, MI)
Inventors: Charles E. Hubbard (Harper Woods, MI), Donald E. Berkemeier (Bloomfield Hills, MI)
Primary Examiner: A. Hugo Word
Assistant Examiner: Brian N. Vinson
Attorney: Phillip S. Oberlin
Application Number: 6/558,102
Classifications
Current U.S. Class: D13/13; D25/74