Washer for mine roof bolt


FIG. 1 is a perspective top and front view of the washer for mine roof bolt showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof; and,

FIG. 5 is an underside view thereof.

Referenced Cited
U.S. Patent Documents
D31242 July 1899 McAllister
2725843 December 1955 Koski
2826108 June 1958 Mills
4619559 October 28, 1986 Norris
Patent History
Patent number: D399730
Type: Grant
Filed: Oct 7, 1996
Date of Patent: Oct 20, 1998
Inventor: Gerald J. Pitre (Bathurst, New Brunswick)
Primary Examiner: B. J. Bullock
Attorney: Mario D. Theriault
Application Number: 0/60,765
Current U.S. Class: D/8399
International Classification: 0808;