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## Freudenberg and NOK are intensifying their joint activities in China with the opening of a new factory for seal production in Changchun. The 2 million (US$2.5 million) invested in this project is a reaction to Chinese customers' increasing demand for sealing products. In all, Freudenberg and NOK
This patent describes a seal for oilfield equipment joints that is designed to permit the use of plastic sealing materials, while overcoming the inherent limitations associated with plastics. It is particularly intended to improve the performance of the seals with respect to their capabilities with
The construction and recording of pressure transducers for measuring atmospheric pressure and total pressure, i.e. a hydraulic weighing lysimeter, is described. The principle of operation consists of a variable concentric capacitor to control the frequency of oscillation of a free-running multivibra
## Abstract A new FabryβPerot (FP) microcavity structure with a novel single deeply corrugated diaphragm (SDCD) is presented for use in pressure sensing. Both analytical expression and finiteβelement model (FEM) are used to evaluate the device's performance. The FP microcavity is fabricated on a si