Composite railroad tie
US4105159A · kind A · utility
Inventor
Key dates
| Filing date | Oct 6, 1976 |
| Grant date | Aug 8, 1978 |
| Priority date | — |
| Expiry date | Oct 6, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31957
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A composite railroad tie of structurally distinct components adhesively joined in layers to form a unit. At least one of the components being of high density phenolformaldehyde bonded particleboard manufactured in a platen press with heat. At least two elements disposed close to and parallel the broad surfaces are composed of lumber with grain direction oriented parallel the long axis. A remaining centermost element, affixed to the above two lumber elements, is relatively non-critical, being selected from lumber or particleboard of adequate shear and compressive strength on the basis of availability, cost, ease of treatment with preservative, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.