Freudenberg has filed a patent for a pressure equalizing device for a housing, featuring a lattice-like cage with a gas passage opening covered by a gas-permeable membrane containing a nonwoven layer of fibers sheathed by elastomer. The device allows for pressure equalization between the inside and outside of the housing. GlobalData’s report on Freudenberg gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Freudenberg, Electromagnetic valve actuators was a key innovation area identified from patents. Freudenberg's grant share as of January 2024 was 48%. Grant share is based on the ratio of number of grants to total number of patents.

Pressure equalizing device for housing with gas-permeable membrane

Source: United States Patent and Trademark Office (USPTO). Credit: Freudenberg & Co KG

The patent application (Publication Number: US20240040716A1) describes a pressure equalizing device for a housing that includes a lattice-like cage with a gas passage opening connecting the inside and outside in a pressure-dependent and flow-conducting manner. The gas passage opening is covered by a gas-permeable membrane containing a nonwoven layer with fibers completely sheathed by an elastomer sheath. The elastomer is specified as a fluoroelastomer (FKM) blend, and the nonwoven layer maintains consistent air permeability in a wide temperature range from -40°C to +150°C. Additionally, the device can include multiple nonwoven layers arranged in series, with one layer designed as a laminate of nonwoven and expanded polytetrafluoroethylene (ePTFE).

Furthermore, the patent application details the configuration of the pressure equalizing device within a housing enclosing electronic components. The housing incorporates the described pressure equalizing device to regulate pressure differentials between the interior and exterior of the housing while ensuring consistent airflow through the gas-permeable membrane. By utilizing the specific design features outlined in the claims, the pressure equalizing device offers a reliable solution for maintaining optimal pressure conditions within electronic component enclosures. The use of elastomer-sheathed nonwoven layers and functional in-series configurations enhances the performance and versatility of the pressure equalizing device, making it suitable for various applications requiring pressure regulation in housing environments.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.