Structures and structural members made wholly or partly of wood
US4174412A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1977 |
| Grant date | Nov 13, 1979 |
| Priority date | — |
| Expiry date | Sep 28, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27K5/006
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A wooden part of a structure or structural member, e.g. a telegraph pole, that is exposed to the atmosphere is impregnated with wood preservative by a vacuum impregnation process. The exposed wooden part of the pole is surrounded by a closely fitting, fluid-impermeable covering, e.g. a polythene shroud, and boundary edges of the covering are sealed to form a substantially fluid-tight enclosure. Air and any other fluid is evacuated from voids in the said wooden part of the pole and from within the fluid-tight enclosure and wood preservative in a flowable state is allowed to enter the enclosure and the voids in said wooden part of the pole until said wooden part is fully impregnated with wood preservative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.