Radiant energy – Ionic separation or analysis
Reexamination Certificate
2007-05-01
2007-05-01
Berman, Jack (Department: 2881)
Radiant energy
Ionic separation or analysis
C250S292000, C250S282000, C250S287000, C250S296000
Reexamination Certificate
active
10497396
ABSTRACT:
A mass filter apparatus for filtering a beam of ions is described. The apparatus comprises an ion beam source and first and second mass filter stages in series to receive the ion beam. A vacuum system maintains the first and second filter stages at substantially the same operating pressure, below 10−3torr. The first mass filter stage transmits only ions having a sub-range of mass-to-charge ratios including a selected mass-to-charge ratio. The second filter transmits only ions of the selected mass-to-charge ratio.The second mass filter can achieve high accuracy detection without being subjected to problems such as build-up of material on quadrupole rods, resulting in a distorted electric field close to the rods. The first mass filter acts as a coarse filter, typically transmitting 1% of ions received from the ion source. Thus, the detection accuracy and lifetime of mass spectrometers embodying this invention are greatly improved.
REFERENCES:
patent: 3129327 (1964-04-01), Brubaker
patent: 4328420 (1982-05-01), French
patent: 4535235 (1985-08-01), McIver, Jr.
patent: 4963736 (1990-10-01), Douglas et al.
patent: 5043575 (1991-08-01), Habfast et al.
patent: 6140638 (2000-10-01), Tanner et al.
patent: 6191417 (2001-02-01), Douglas et al.
patent: 6340814 (2002-01-01), Vandermey
patent: 2001/0038069 (2001-11-01), Whitehouse et al.
patent: 0373835 (1990-06-01), None
patent: 1109198 (2001-06-01), None
patent: 1114437 (2001-07-01), None
patent: 2301704 (1996-12-01), None
patent: 2370686 (2002-07-01), None
patent: 05036376 (1993-02-01), None
patent: 09082274 (1997-03-01), None
patent: WO95/23018 (1995-08-01), None
patent: WO 99/30351 (1999-06-01), None
patent: WO01/15201 (2001-03-01), None
PCT Search Report (Forms PCT/ISA/ 210) prepared by the European Patent Office for PCT Application No. PCT/GB03/02041, 4 pages.
Search Report for British Patent Application No. GB0210930.4 dated Feb. 26, 2003 (2 pages).
Combined Search and Examination Report for British Patent Application No. GB0311003.8 dated Jul. 1, 2003 (5 pages).
Berman Jack
Hashmi Zia R.
Haynes and Boone LLP
Thermo Fisher Scientific Inc.
LandOfFree
Mass spectrometer and mass filters therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mass spectrometer and mass filters therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mass spectrometer and mass filters therefor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3757474