Manufacture of built-up roofing products with moisture conditioned fibrous mats

Patent 5932287 Issued on August 3, 1999. Estimated Expiration Date:

December 18, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3783000

Bulky asphalt-impregnated sheet having different properties on both surfaces
Patent #: 4107375
Issued on: 08/15/1978
Inventor: Iwasaki , et al.

Method for making a reinforced product of bituminous material
Patent #: 4873303
Issued on: 10/10/1989
Inventor: Blackwood, et al.

Fire resistant roofing system Patent #: 5169690
Issued on: 12/08/1992
Inventor: Zimmerman, et al.

Inventors

Application

No. 992993 filed on 12/18/1997

US Classes:

427/315, Steam utilized427/209, APPLICATION TO OPPOSITE SIDES OF SHEET, WEB, OR STRIP (EXCLUDING PROCESSES WHERE ALL COATING IS BY IMMERSION)427/299, WITH PRETREATMENT OF THE BASE427/443Wax, oil, asphalt, or bitumen containing coating

Examiners

Primary: Beck, Shrive
Assistant: Barr, Michael

Attorney, Agent or Firm

Touslee; Robert D.

International Class

B05D 003/00

Abstract

A method of manufacturing roofing felts, cap sheets, base sheets and similar built-up roofing products from fibrous mats includes: supplying a roofing mat to a manufacturing process; moisturizing the roofing mat by applying steam or a liquid mist to one or both major surfaces of the roofing mat during the manufacturing process to increase the moisture content of the roofing mat and reduce the amount of hot bitumen accepted by the roofing mat during a coating operation; and applying a hot bitumen coating to one or both major surfaces of the roofing mat during the manufacturing process after the moisture content of the roofing mat has been increased by the moisturizing step.