The patent's assignee for patent number 8720794 is
News editors obtained the following quote from the background information supplied by the inventors: "(1) Field of the Invention
"The invention generally relates to gas permeating or gas emitting systems. More particularly, the invention relates to a gas permeating system using an amorphous fluorpolymer material.
"(2) Description of the Related Art
"Other permeation devices or tube devices are known in the related art and are widely used to deliver or generate known gas mixtures of various chemicals. Devices in the related art are used for the testing and calibration of air pollution instruments, chemical and petrochemical process analyzers and safety equipment.
"An early device was disclosed by
"Subsequently, Chand in U.S. Pat. Nos. 3,856,204 and 4,399,942 described the use of silicone material to obtain higher permeation rates and low temperature dependency. However, the use of silicone has been limited to mostly non-corrosive materials and was found unsuitable for gases like nitrogen dioxide and sulfur dioxide.
"In U.S. Pat. No. 5,310,838 issued on
"In U.S. Pat. No. 5,324,889 issued on
"As the use of silicone in permeation devices has limitations regarding the use of corrosive material there is room in the art for new means and methods of creating gas permeation devices. While the known prior art uses various types of amorphous fluoropholymer materials for impervious surfaces there is room in the art for unobvious or more artful uses for amorphous fluoropholymer materials."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventor's summary information for this patent: "The embodiments of the present inventions overcomes shortfalls in the related art by presenting an unobvious and unique combination, configuration and use of an amorphous fluoropolymer material [chemical name: fluorinated (ethylenic-cyclo oxyaliphatic substituted ethylenic) copolymer], as the material through which gas permeates within disclosed embodiments of gas permeation devices.
"One embodiment of amorphous fluoropolymer material is made by
"The unexpected results of the disclosed devices are supported in the less impressive results reported in the related art. For example, O'Keeffe, in the '935 patent describes the increase in permeation rate of his device made with FEP material to increase almost 100% when the temperature is increased approximately 9 degrees Celsius. Additionally, the usefulness of the O'Keeffe device is limited to the generation of permeation rated less than 1,000 nanograms/minute. While these issues were addressed by Chand in his prior patents, the effective use of the prior art devices was limited to non-corrosive and non-reactive gases to the silicone material. The devices of the prior art were found to be unstable for substances such as sulfur dioxide and nitrogen dioxide.
"The novelty and unobvious nature of the disclosed embodiment is supported by unexpectedly good test results. For example, the results obtained with sulfur dioxide showed astounding improvements as compared to the known related art. Permeation rates from less than 200 to over 10,000 nanograms per minute were achieved using Teflon AF. Additionally, the temperature dependency was found to be cut in less than half, as compared to the prior art devices using FEP and PTFE.
"Additionally, the embodiments of the present inventions overcome shortfalls in the related art by the artful use and unobvious configuration of membranes made with amorphous fluoropolymer material. For example, in one embodiment, an amorphous fluoropolymer membrane is manufactured with a plurality of protrusions, with the protrusions inserted into voids of a top cap. Membrane protrusions within the top cap voids present a significant and unobvious departure from the related art.
"These and other objects and advantages will be made apparent when considering the following detailed specification when taken in conjunction with the drawings."
For additional information on this patent, see: Chand, Ramesh. Gas Permeation Devices. U.S. Patent Number 8720794, filed
Keywords for this news article include: Chemicals, Chemistry, Silicones, Siloxanes, Chalcogens, Legal Issues, Sulfur Oxides, Sulfur Dioxide, Nitrogen Dioxide,
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC
Most Popular Stories
- National Retail Federation Reduces Sales Forecast
- Xavier Gutierrez Appointed to Bank Board
- Long-term Strengths Emerge in U.S. Economy
- Hispanic Leader Goes the Extra Mile
- Honda' s Accord Plug-in Hybrid Is a Fuel Miser
- Weekly Jobless Claims Drop to Lowest Level in 8 Years
- Naya Rivera and Ryan Dorsey Are Married
- Menendez: No Arms for Iraq Without Intel
- Self-Induced Abortions Rise After Texas Closes Clinics
- Amazon Fire Phone Improves on Familiar: Review