The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 1996
Filed:
Jan. 03, 1995
Applicant:
Inventor:
Dennis Mraz, Saskatoon, CA;
Assignee:
DM Technologies Ltd., Saskatoon, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21C / ; E21C / ;
U.S. Cl.
CPC ...
299 18 ; 299 64 ;
Abstract
A method and apparatus for haulage of material in a self-propelled vehicle on a sloped surface by supplementing traction force of the self-propelled vehicle by rope under variable tension in order to achieve the desired velocity of haulage.