Mine roof support plate
Description
FIG. 1 is a perspective view of a mine roof support plate showing our new design;
FIG. 2 is a bottom view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a right side view relative to FIG. 2.
FIG. 5 is a front view relative to FIG. 2;
FIG. 6 is a cross-sectional view taken in the direction of the arrows on line 6--6 of FIG. 2;
FIG. 7 is a cross-sectional view taken in the direction of the arrows on line 7--7 of FIG. 2;
The left side view is identical to the right side view, and the rear view is identical to the front view.
Referenced Cited
U.S. Patent Documents
Other references
D236428 | August 1975 | Stewart et al. |
2854824 | October 1958 | Curry et al. |
4095431 | June 20, 1978 | Hannan |
4112693 | September 12, 1978 | Collin et al. |
4371293 | February 1, 1983 | Wilcox et al. |
4476660 | October 16, 1984 | Francovitch |
4518282 | May 21, 1985 | Wilcox et al. |
- Brochure entitled: "Keeping the Roof Over Your Head", published by Keystone Bolt Company, Copyright 1979. Brochure entitled: "Tazewell Underground Roof Control Products and Services", published by Tazewell Industries (undated).
Patent History
Patent number: D301687
Type: Grant
Filed: Nov 13, 1985
Date of Patent: Jun 20, 1989
Inventors: Bruce A. Cassidy (Richmond, OH), James O. Gray (Rayland, OH)
Primary Examiner: B. J. Bullock
Law Firm: Fleit, Jacobson, Cohn & Price
Application Number: 6/805,102
Type: Grant
Filed: Nov 13, 1985
Date of Patent: Jun 20, 1989
Inventors: Bruce A. Cassidy (Richmond, OH), James O. Gray (Rayland, OH)
Primary Examiner: B. J. Bullock
Law Firm: Fleit, Jacobson, Cohn & Price
Application Number: 6/805,102
Classifications
Current U.S. Class:
D/8399;
D/8353