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:
May. 28, 1996
Filed:
Aug. 15, 1994
Owens-Corning Fiberglas Technology, Inc., Summit, IL (US);
Abstract
A method for applying granules to a coated sheet, and in particular a coated asphaltic sheet for use in the manufacture of roofing, comprises controlling a fluid (e.g., pneumatic) counterflow through the discharge opening of a nozzle which holds an accumulation of granules therein to rapidly stop or otherwise modify the flow rate of granules onto the sheet. A buffer chamber is in communication with the granule accumulation in the nozzle, and an apparatus modifies the pressure in the buffer chamber to generate the desired fluid flow through the nozzle opening. A vacuum source provides a negative pressure for a pneumatic counterflow, and a positive pressure source is utilized to increase pressure in the buffer chamber to act as a discharge assistant.