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:
Jun. 26, 1990
Filed:
Jan. 29, 1988
Derek Ferns, Gwent, GB;
Van Roll AG, Gerlafingen, CH;
Abstract
A frame for a manhole comprises a cylindrical pipe portion and an outwardly projecting lateral flange portion located on the outside of the pipe portion. Projections are provided on the inside of the portion and on these can be supported a cover or grating. The flange portion is constructed as a cohesive collar, which projects substantially horizontally outwards. The flange portion is located at a height below the upper border of the pipe portion. This height is a third to a half of the total height of the pipe portion. Due to the fact that the flange portion is spaced from the upper end of the pipe portion, during the installation of the frame, it is surrounded at all sides by the material of the ground surface, so that the frame is connected in stable manner to the ground material and cannot be significantly displaced by the traffic flow.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile