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:
Sep. 03, 1991
Filed:
Oct. 13, 1988
Applicant:
Inventor:
Leif M Jensen, Roskilde, DK;
Assignee:
Rockwool International A/S, Hedehusene, DK;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
21912136 ; 21912151 ; 21912137 ; 21912138 ; 21912159 ; 373 22 ; 373 24 ;
Abstract
In a method for the preparation of a melt for the production of mineral wool a raw material is introduced at the top of a shaft furnace and heated to melting temperature partly with a hot gas formed by plasma heating and partly with a hot gas formed by combustion of one or more gaseous hydrocarbons, the latter gas stream being introduced at a level at which the temperature does not exceed 1250.degree. C., and the melt formed is discharged at the bottom of the shaft furnace.