The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 29, 1991
Filed:
Dec. 21, 1988
Kazuei Kenmochi, Hirakata, JP;
Dresser Industries, Inc., Dallas, TX (US);
Abstract
A plastic optical element with good dimensional accuracy and no strain is produced by providing a mold having a cavity corresponding to a shape of the optical element and a feed passage which communicates with said cavity, at least one side of which mold for forming one surface of the optical element is made of a light transmitting material so that light can pass through said material into the mold cavity, charging a photocurable plastic material through said feed passage into said cavity, irradiating a central part of said cavity with light which initiates a photocuring reaction, and enlarging the light in the form of a ring until the lighted area reaches the periphery of the cavity so as to cure the entire photocurable plastic material. The light irradiation is carried out while a supplementary portion of the photocurable plastic material is maintained in said feed passage.