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US 6,120,875 AGranted
Transparent micro perforated material and preparation process
AssigneeCyclopore S.A.
InventorsCharles Haumont, Roger Legras
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AssigneeCyclopore S.A.
InventorsCharles Haumont, Roger Legras
Estimating the term…
The subject of the present invention is a solid material in the form of a microperforated sheet transparent to light of wavelengths in the visible and infrared, characterized in that the mean distance between two immediately neighbouring perforations is at least 5, and preferably 7 .mu.m, and is so over each face of the material. Preferably, the mean angle of inclination of the perforations through the thickness of the material is less than 10.degree., even 5.degree.. In a particular embodiment, the material is a membrane produced from a flexible polymer film with a thickness lying between 0.1 and 100 .mu.m, more generally between 5 and 50 .mu.m, and the perforation diameters lying between 0.01 and 15 .mu.m. The membranes obtained according to the invention are particularly useful as support membranes for viewing in an optical microscope or in infrared spectroscopy. They may also be used as filter membranes or, amongst other applications, as a support for cell culture.
A filtration membrane in the form of a microperforated sheet transparent to wavelengths in the visible and infrared spectrums, the sheet comprising a material transparent in the non-perforated state having perforations with a mean distance l.sub.m between circumferences of neighboring perforations between 5 .mu.m and 100 .mu.m on each face of the material, and having a thickness e of 0.1 to 50 .mu.m wherein the perforations include a perforation diameter d between 0.01 and 15 .mu.m, and a mean angle alpha of inclination through the material between 0.degree. and 10.degree. with respect to an axis perpendicular to the sheet of material.
A filtration membrane in the form of a microperforated sheet transparent to wavelengths in the visible and infrared spectrums, the sheet comprising a material transparent in the non-perforated state having a thickness e of 0.1 .mu.m to 50 .mu.m, perforations with a mean distance l.sub.m between circumferences of neighboring perforations of at least 5 .mu.m on each face of the material and a mean angle .alpha. of inclination of the perforations through the material not greater than 10.degree. with respect to an axis perpendicular to the sheet of material.
Dependencies are inferred from the claim text.