Roofing element

Patent 4662141 Issued on May 5, 1987. Estimated Expiration Date:

February 10, 2006. 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

1931709

2210941

3862532

Roofing tile Patent #: 4432183
Issued on: 02/21/1984
Inventor: Pike , et al.

Inventor

Miko, Hans-Jurgen

Assignee

Eternit-Werke Ludwig Hatschek Aktiengesellschaft (AT)

Application

No. 06/828007 filed on 02/10/1986

US Classes:

52/553, With spacing or space-forming feature52/478, Lapped multiplanar surfacing attached to substructure arrangement52/518, LAPPED MULTIPLANAR SURFACING; E.G., SHINGLE TYPE52/533Joint with fluid-handling feature

Examiners

Primary: Bell, J. Karl

Attorney, Agent or Firm

Townsend and Townsend

International Classes

E04D 1/04 (20060101)
E04D 1/02 (20060101)

Foreign Application Priority Data

1985-02-13 AT

Abstract

The invention relates to a roofing element, in particular a concrete roofing panel, at whose underside extend a suspension ledge and a base rib, while at least two cross ribs of lesser thickness than the base rib extend in the covering or overlapping region next to the base rib and parallel thereto, with the basic surface of the base rib extending parallel in relation to the outer surface of the roofing element. For increasing the tightness of the roofing element, the thickness of the roofing element of optionally S-shaped or wave-shaped cross section in the apex of the cross rib farthest removed from the base rib is slightly, up to 6 percent at the most, less than the thickness of the roofing element in the base rib and the height of further cross ribs disposed between the base rib and the cross rib farthest removed from the base rib is less than the height of the cross rib farthest removed from the base rib.