Electric heating – Microwave heating – Field modification
Patent
1999-03-04
2000-07-25
Leung, Philip H.
Electric heating
Microwave heating
Field modification
219750, 219679, 73 2335, 95 87, 422 21, H05B 680, H05B 672, G01N 3002
Patent
active
060939214
ABSTRACT:
A microwave heating apparatus is used for heating a chromatographic column assembly containing a microwave absorbing material. The microwave heating apparatus includes an antenna transmitting a microwave signal and a resonant cavity containing the chromatographic column assembly and the antenna. The chromatographic column assembly extends relative to predetermined electromagnetic field strength contours within the resonant cavity to provide a predetermined heating profile along the length of the chromatographic column assembly. For example, a single-mode chromatographic column microwave oven can be used to heat a coiled chromatography column to a desired temperature gradient along its length. Oven design embodiments utilizing coaxial transmission line structures, coaxial resonators, and cylindrical resonators are described. To control the electromagnetic field gradient in the axial direction, the oven designs provide for varying some part of the oven geometry in the axial direction. For best operation, vacuum conditions should be established within the oven during heating cycles.
REFERENCES:
patent: 3023835 (1962-03-01), Brashear
patent: 3169389 (1965-02-01), Green et al.
patent: 3232093 (1966-02-01), Burow et al.
patent: 3527567 (1970-09-01), Philyaw et al.
patent: 4202423 (1980-05-01), Jordan
patent: 4339648 (1982-07-01), Jean
patent: 4347216 (1982-08-01), Kawasaki et al.
patent: 4861556 (1989-08-01), Neas et al.
patent: 4882286 (1989-11-01), Neas et al.
patent: 4904450 (1990-02-01), Floyd
patent: 5005399 (1991-04-01), Holtzclaw et al.
patent: 5009099 (1991-04-01), Wells et al.
patent: 5022756 (1991-06-01), Rhodes
patent: 5066843 (1991-11-01), Revesz
patent: 5131993 (1992-07-01), Suib et al.
patent: 5314664 (1994-05-01), Sperling et al.
patent: 5377426 (1995-01-01), Pare
patent: 5427741 (1995-06-01), Bennett
patent: 5443795 (1995-08-01), Revesz
patent: 5447052 (1995-09-01), Delaune et al.
patent: 5471037 (1995-11-01), Goethel et al.
patent: 5519947 (1996-05-01), Pare
patent: 5675909 (1997-10-01), Pare
patent: 5808178 (1998-09-01), Rounbehler et al.
Gaisford Scott
Walters David L.
Leung Philip H.
MT Systems, LLC
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