Method of manufacturing a thermoset polymer utility vault lid
US10265890B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 10, 2015 |
| Grant date | Apr 23, 2019 |
| Priority date | — |
| Expiry date | Aug 27, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2439/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing a fiber reinforced composite material lid for an utility vault including mixing an unsaturated polyester thermosetting matrix in to a resin paste, compounding the resin paste into a fiber reinforced composite material, maturing the compounded fiber reinforced composite material, cutting the matured compound into a charge pattern, molding the charge pattern in a mold cavity of a heated mold under low pressure to form the lid and cooling and machining the lid. The mold includes a cavity die and a core die having a shear angle for interfacing the core die within the cavity die and a steam pot for heating the cavity die and the core die, wherein the lid is molded between the cavity die and the core die and removed from the mold by a lid ejection mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.