Interested in licensing this patent?
MTEC can help explore whether this patent might be available for licensing for your application.
Publication Number
US-9317068-B2
Publication Date
2016-04-19
Expiration Date
Abstract
The technology encompassed by the current disclosure generally relates to membrane composites that can be used in acoustic venting assemblies. In one embodiment of the technology disclosed herein, a venting media composite has a microporous membrane layer and a coating on the microporous membrane layer to form a composite. The basis weight of the composite is at least about 0.5% higher than a basis weight of the microporous membrane layer without the coating. In some embodiments the composite has a decreased insertion loss than its membrane-only counterpart.
Core Innovation
The disclosed invention provides a venting media composite that includes a microporous membrane layer comprising polytetrafluoroethylene and a coating on the microporous membrane layer. The microporous membrane layer and the coating form a composite in which the basis weight of the venting media composite is at least about 3% higher than a basis weight of the microporous membrane layer without the coating, while the composite has an average insertion loss less than or equal to the average insertion loss of the microporous membrane layer without the coating in a frequency range from 300 Hz to 4000 Hz.
A related composite membrane is provided with a microporous membrane and a coating on the microporous membrane, where the average transmission loss of the composite membrane is at least 10% more than the average transmission loss of the microporous membrane alone in the frequency range from 300 Hz to 4000 Hz. In the same frequency range, the composite membrane has an average insertion loss that is less than the average insertion loss of the microporous membrane alone, thereby increasing transmission loss while maintaining reduced insertion loss relative to the uncoated microporous membrane.
The invention also specifies a venting media composite in which the coating comprises a chromium-containing metal complex colorant while preserving acoustic performance. The disclosed embodiments further relate the composite membrane to installation in an enclosure opening, including performance when the enclosure is immersed in 1 meter of water for 30 minutes without water ingress.
Claims Coverage
The independent claims define three main inventive compositions and performance constructs, each grounded in a coated microporous membrane having specified acoustic performance across 300 Hz to 4000 Hz and, in some embodiments, specified environmental performance for use at an enclosure opening. Across the independents, inventive features include a basis weight increase with constrained insertion loss, a transmission-loss improvement with insertion-loss reduction, and a chromium-containing metal complex colorant coating with constrained insertion loss, including water-immersion survivability at an opening.
Coated polytetrafluoroethylene microporous membrane composite with basis-weight increase and insertion-loss constraint
A venting media composite comprising a microporous membrane layer comprising polytetrafluoroethylene; and a coating on the microporous membrane layer, wherein the microporous membrane layer and the coating are a composite, wherein the basis weight of the venting media composite is at least about 3% higher than a basis weight of the microporous membrane layer without the coating, and wherein the composite has an average insertion loss less than or equal to the average insertion loss of the microporous membrane layer without the coating in a frequency range from 300 Hz to 4000 Hz.
Coated composite membrane with increased transmission loss and reduced insertion loss over 300 Hz to 4000 Hz
A composite membrane comprising a microporous membrane and a coating on the microporous membrane, wherein the average transmission loss of the composite membrane is at least 10% more than the average transmission loss of the microporous membrane alone in a frequency range from 300 Hz to 4000 Hz, and the average insertion loss of the composite membrane is less than the average insertion loss of the microporous membrane alone in the frequency range from 300 Hz to 4000 Hz.
Chromium-containing metal complex colorant-coated venting media composite with insertion-loss constraint
A venting media composite comprising a microporous membrane layer and a coating on the microporous membrane layer, the coating comprising a chromium-containing metal complex colorant; wherein the composite has an average insertion loss less than or equal to the average insertion loss of the microporous membrane layer without the coating in a frequency range from 300 Hz to 4000 Hz.
Overall, the claims are directed to coated composites based on a microporous membrane, including polytetrafluoroethylene, where the coating increases basis weight and/or transmission loss relative to the uncoated microporous membrane while maintaining insertion loss that is no greater than or less than the uncoated membrane over 300 Hz to 4000 Hz. Additional claim coverage includes a chromium-containing metal complex colorant in the coating and, in certain dependents, installation in an enclosure opening with water-immersion performance tied to preventing water ingress.
Stated Advantages
Increases basis weight, at least about 3% higher than the microporous membrane layer without the coating, while maintaining an average insertion loss less than or equal to the uncoated microporous membrane over 300 Hz to 4000 Hz.
Provides average transmission loss at least 10% more than the microporous membrane alone over 300 Hz to 4000 Hz while having average insertion loss less than the microporous membrane alone over the same frequency range.
Enables use of a coating comprising a chromium-containing metal complex colorant while keeping average insertion loss less than or equal to the uncoated microporous membrane over 300 Hz to 4000 Hz.
Allows an enclosure to withstand immersion in 1 meter of water for 30 minutes without water ingress when the composite is configured or installed in an enclosure opening.
Documented Applications
Use of the venting media composite or composite membrane installed in an opening of an electronic enclosure, including withstanding enclosure immersion in 1 meter of water for 30 minutes without allowing water ingress.
Interested in licensing this patent?