Mine roof support plate

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Information

Patent Grant
D258718

References
Source

Patent Number
D258,718
Date Filed
Monday, August 21, 1978
46 years ago
Date Issued
Tuesday, March 31, 1981
43 years ago

Inventors
- Alvaro L. Collin
- Gordhan M. Patel
Original Assignees
- Kaiser Steel Corporation
Examiners
- Bullock; B. J.
Agents
- Naylor, Neal & Uilkema

US Classifications
- D08 - Tools and hardware
Field of Search
- US
- D08 349
- D08 354
- D08 382
- D08 399
- D08 499
- 405 259
- 052 1691
- 052 698
International Classifications
- Term of Grant
  14Years

Information

Abstract

Description

Claims

The ornamental design for a mine roof support plate, as shown and described.

US Referenced Citations (3)

Number	Name	Date	Kind
D34939	Taylor	Aug 1901
2748594	Edwards	Jun 1956
2854824	Curry et al.	Oct 1958

Non-Patent Literature Citations (1)

Entry
"Handbook of Designs & Devices," by C. P. Hornung, .COPYRGT.1932, p. 24, quatrefoil configuration 212.