Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Reexamination Certificate
2008-07-01
2008-07-01
Thomas, Eric (Department: 2831)
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
C361S321600
Reexamination Certificate
active
11509781
ABSTRACT:
A tubular capacitor with variable capacitance, including a cylindrical tube (3) of dielectric material, a metallic outer electrode (1) which surrounds the cylindrical tube (3), and an inner electrode which can axially move in the inner bore (41) of the cylindrical tube (3) and which abuts the inner bore (41), wherein the inner electrode includes a metallic rod (2; 2a; 2b; 2c), is characterized in that the metallic rod (2; 2a; 2b; 2c) is axially extended at its end (5′), located in the inner bore (41) of the cylindrical tube (3), using a rod (9; 9a; 9b; 9c) of dielectric material. The inventive tubular capacitor has an increased dielectric strength and improves the resolution of NMR spectrometers.
REFERENCES:
patent: 3329875 (1967-07-01), Demeritt
patent: 3360700 (1967-12-01), Ainley
patent: 3361945 (1968-01-01), Mittler et al.
patent: 3731165 (1973-05-01), Solow
patent: 3938012 (1976-02-01), Patti
patent: 4389762 (1983-06-01), Reeves
patent: 5856769 (1999-01-01), Kiser
patent: 2003/0137300 (2003-07-01), Gonella
patent: 2005/0168223 (2005-08-01), Zeiger et al.
patent: 1 108 809 (1963-10-01), None
“Avance—The Pulse Of Innovation”, Bruker BioSpin AG, Faellanden, Switzerland Apr. 2004.
Grossniklaus Beat
Schett Oskar
Seydoux Roberto
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