Mine roof support plate

- Kaiser Steel Corporation
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Description

FIG. 1 is a bottom, perspective view of a mine roof support plate showing our new design;

FIG. 2 is a bottom plan view of FIG. 1;

FIG. 3 is a side elevational view of FIG. 1;

FIG. 4 is a top plan of FIG. 1;

FIG. 5 is a bottom perspective view of a second embodiment of the design of FIG. 1, the only difference being the bending of a corner and the inclusion of an aperture in said corner.

Referenced Cited
U.S. Patent Documents
D34939 August 1901 Taylor
2748594 June 1956 Edwards
2854824 October 1958 Curry et al.
Other references
  • "Handbook of Designs & Devices," by C. P. Hornung, .COPYRGT.1932, p. 24, quatrefoil configuration 212.
Patent History
Patent number: D258718
Type: Grant
Filed: Aug 21, 1978
Date of Patent: Mar 31, 1981
Assignee: Kaiser Steel Corporation (Oakland, CA)
Inventors: Alvaro L. Collin (Orinda, CA), Gordhan M. Patel (Cerritos, CA)
Primary Examiner: B. J. Bullock
Law Firm: Naylor, Neal & Uilkema
Application Number: 5/935,746
Classifications
Current U.S. Class: D/8399; D/8354
International Classification: D0808;