Septic tank having deformation-resisting top access flange
US8789714B1 · kind B1 · utility
8Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2010 |
| Grant date | Jul 29, 2014 |
| Priority date | — |
| Expiry date | Oct 23, 2030 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03F11/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A plastic septic tank has a body made by rotational molding or blow molding and at least one access opening in the top. A ring flange is structurally attached to the top of the body so the bore of the flange fits the access opening. A plastic ring flange has a flexural modulus which is greater than 100,000 psi and at least twice the flexural modulus of the plastic material of the tank body. An exemplary flange is made of a plastic material which includes 5-30 weight percent glass fibers, a significant portion of which are aligned with the plane of the flange upper surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.