Thermal measuring and testing – Thermal gravimetric analysis
Reexamination Certificate
2005-03-29
2005-03-29
Fulton, Christopher W. (Department: 2859)
Thermal measuring and testing
Thermal gravimetric analysis
C374S001000, C374S176000, C252S408100, C252S062550, C252S962000, C324S203000
Reexamination Certificate
active
06871998
ABSTRACT:
The invention provides a method for accurately calibrating a vacuum thermogravimetric analyzer (VTGA). The invention solves the problem of calibrating a VTGA by using the actual magnetic transitions and associated transition temperatures, or Curie temperatures, Tc's, of a set of standards which can be used in-situ at the location of the sample holder obviating the difficulties associated with indirect methods of calibration. The invention encompasses a method of using a set of calibration standards comprised of a plurality of ferromagnetic slugs to provide a temperature calibration for a VTGA. The method permits accurate calibration through sufficiently numerous calibration points over a rather limited low-temperature range for determining vapor pressures of compounds. Through the use of these standards, highly accurate measurements can be made of the vapor pressures of critical hard disk drive compounds, such as lubricants, and corrosion inhibitors, that are crucial to competitive disk drive technology.
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ASTM E1582-00, “Standard Practice for Calibration of Temperature Scale for Thermogravimetry,” ASTM, Committee: E37.01 (Published Apr. 2001), 9 pages.*
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www.ssi.shimadzu.com/service/pdfs/tga_call.pdf “standard cleaning and calibration procedure for TGA-50 Certified Curie Point standards” (SRM-71 N1st) p. 1-9 (no date).
ASTM-Summary Practice E1582-93- “Standard Practice for Calibration of Temperature Scale for Thermogravimetry” (Publ. Jan. 1994) (1 page).
Kelsey and Truttmann; “Complete Thermogravimetric Analysis” May 1997 pp. 16, 18, 20, 22.
http://www.n/ci.com/users/gundlach/calib_stand.html; Curie Point Standards For TGA Calibration. (8 pages, Mar. 2001).
Carter Malika Dothresa
Parker Michael Andrew
Fulton Christopher W.
Hitachi Global Storage Technologies - Netherlands B.V.
Nunnelley Lewis L.
Pruchnic Jr. Stanley J.
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