Extruding reduced viscosity silica into green body, purification and sintering
CA 1279289 C · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Derks, Pierre L.L.M.; Lersmacher, Bernhard; Lydtin, Hans-Jurgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for manufacturing a glass body is described. A mechanical force is applied to a gel formed from a thixotropic suspension of SiO2 particles to reduce the viscosity of the gel. The gel is forced while it is in this reduced viscosity state through a die to form an extruded green body. The green body is then purified and sintered to form a glass body. The apparatus preferably includes an extruding press provided with a ram in the form of a sonotrode of a sonic or ultrasonic generator with a pressure p in the range from 1 to 7.105 Pa and with an oscillation amplitude of the sonotrode in the range from 0 to 60 µm.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 22, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 22, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.