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:
Apr. 13, 1976
Filed:
May. 07, 1973
Freeman B Jones, Jr, Westlake Village, CA (US);
Rockwell International Corporation, El Segundo, CA (US);
Abstract
When a nematic liquid crystal has been doped to maximize its contrast ratio, its cutoff frequency (that above which all dynamic scattering ceases) can be further increased up to about 500% by adding small amounts of an ionic dpoant to the doped nematic crystal. The ionic dopant is R.sub.1 R.sub.2 R.sub.3 R.sub.4 N.sup.+B.sup.-(R.sub.5).sub.4, where R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 may be the same or different alkyl or aryl groups. The alkyl groups having the formula CH.sub.3 (CH.sub.2).sub.n, where n is a positive integer or zero and the aryl groups being either phenyl or biphenyl. Ammonium boride.sup.-18, (C.sub.18 H.sub.37).sub.2 (CH.sub.3).sub.2 N.sup.+B.sup.-(C.sub.6 H.sub.5).sub.4, is the preferred ionic dopant.