Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1993-09-20
1994-12-27
Walsh, Donald P.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
428546, 428605, 428606, 428607, 428610, 428611, 428615, 75255, 252572, B22F 900
Patent
active
053764633
ABSTRACT:
A grating (22) of narrow parallel ridges (24) is formed in the surface (26) of a substrate (20) made of a hard material such as silicon dioxide. Metal (40) is deposited onto the grating (22) perpendicular to the ridges (24) at an angle of approximately 45.degree. to the surface (26) of the grating such that the metal (40) is deposited onto the top (24a) and one of the sides (24b) of the each of the ridges (24) to form generally L-shaped metal strips (12') thereon. The metal strips (12') are cut at periodic intervals along the ridges (24) to produce anisometric metal needles (12). The substrate (20) is immersed in a dielectric fluid (14), and ultrasonic energy is applied to cause the needles (12) to release from the substrate (20) into suspension in the fluid (14). The L-shape of the needles (12) makes them resistant to bending. The suspension (10) has birefringent properties similar to liquid crystals, but may be electrically switched at much higher speed. The index of refraction of the suspension (10) varies in accordance with the alignment of the needles (12), thereby enabling the direction and phase of an electromagnetic wave propagating through the suspension (10) to be controlled by varying the magnitude of the applied electric field.
REFERENCES:
patent: 3040625 (1962-06-01), Zito, Jr.
patent: 3367872 (1968-02-01), Martinek et al.
patent: 3385793 (1968-05-01), Klass et al.
patent: 3412031 (1968-11-01), Martinek et al.
patent: 3427247 (1969-02-01), Peck
patent: 3655267 (1972-04-01), Forlini
patent: 3813265 (1974-05-01), Marks
patent: 4400432 (1983-08-01), Buxbaum et al.
patent: 4543207 (1985-09-01), Sato
patent: 4737886 (1988-04-01), Pedersen
patent: 4776868 (1988-10-01), Trotter, Jr. et al.
patent: 5104745 (1992-04-01), Cave et al.
patent: 5179993 (1993-01-01), Bak et al.
patent: 5217638 (1993-06-01), Hattori et al.
patent: 5252441 (1993-10-01), James et al.
patent: 5296155 (1994-03-01), Reitz
patent: 5308552 (1994-05-01), Bak et al.
patent: 5316687 (1994-05-01), Bloink et al.
patent: 5320770 (1994-06-01), Conway et al.
patent: 5320910 (1994-06-01), Banno et al.
Bak Chan S.
Miller Leroy J.
Van Ast Camille I.
Denson-Low W. K.
Duraiswamy V. D.
Hughes Aircraft Company
Jenkins Daniel
Walsh Donald P.
LandOfFree
Anisometric metal needles with L-shaped cross-section does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Anisometric metal needles with L-shaped cross-section, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anisometric metal needles with L-shaped cross-section will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-918209