Stephen H Smallcombe, 816846 Double Eagle Rd, Mariposa, CA 95338
Stephen Smallcombe Phones & Addresses
6846 Double Eagle Rd, Mariposa, CA 95338
Pollock Pines, CA
133 Stratford St, Redwood City, CA 94062 650-3678205
Cupertino, CA
El Dorado, CA
19741 Bixby Dr, Cupertino, CA 95014
Work
Position:
Service Occupations
Education
Degree:
Bachelor's degree or higher
Mentions for Stephen H Smallcombe
Publications & IP owners
Us Patents
Solvent Suppression Method For Lc-Nmr And High-Resolution-Nmr
US Patent:
5847564, Dec 8, 1998
Filed:
Dec 23, 1996
Appl. No.:
8/774067
Inventors:
Stephen H. Smallcombe - Redwood City CA
Steven L. Patt - Cupertino CA
Paul A. Keifer - Mountain View CA
Steven L. Patt - Cupertino CA
Paul A. Keifer - Mountain View CA
Assignee:
Varian Associates, Inc. - Palo Alto CA
International Classification:
G01V 300
US Classification:
324307
Abstract:
Improved solvent suppression in NMR data is achieved using pulse sequences wherein each of a series of selective excitation pulses are followed by a magnetic gradient pulse and a delay, where the magnetic gradient pulse amplitudes monotonically decrease by a selected fraction of the preceeding gradient pulse. Decoupling a second nucleus during selective excitation pulses has been shown to be efficacious for suppression of organic solvents.
Accelerating Nmr Sample Thermal Equilibration By Rf Heating
US Patent:
6218835, Apr 17, 2001
Filed:
Aug 2, 1999
Appl. No.:
9/365190
Inventors:
Stephen H. Smallcombe - Redwood City CA
Assignee:
Varian, Inc. - Palo Alto CA
International Classification:
G01V 300
US Classification:
324315
Abstract:
Radio-frequency (RF) heating is used to accelerate the thermal equilibration of dielectrically lossy nuclear magnetic resonance (NMR) samples. High-power heating RF pulses are applied to the sample before lower-power measurement RF pulses, using any of the NMR probe coils. The heating pulses are offset in frequency relative to the measurement pulses, such that the heating pulses do not magnetically affect the spins of interest. Heating pulse sequences of decreasing power can be used to prevent the sample temperature from overshooting the desired equilibrium temperature. Heating RF pulses can pre-establish the thermal effects of both measurement-independent and measurement-dependent heating. For pre-establishing the thermal effects of measurement-dependent heating, the heating pulse transients are chosen to be proportional to subsequent measurement pulse transients.
Time Correction For Digital Filters In Transient Measurments
US Patent:
5867410, Feb 2, 1999
Filed:
Sep 27, 1996
Appl. No.:
8/723967
Inventors:
Stephen H. Smallcombe - Redwood City CA
Steven L. Patt - Cupertino CA
Steven L. Patt - Cupertino CA
Assignee:
Varian Associates, Inc. - Palo Alto CA
International Classification:
G06F 1710
G01V 300
G01V 300
US Classification:
364724011
Abstract:
Observation of transient phenomena in an oversampled regime is implemented with a time correction obtained by prepending one or more pseudo datums to the oversampled data to constitute an effective negative delay for the oversampled data set including the pseudo datums. For an oversampling factor N and oversampling rate. omega. sub. s, a digital filter furnishes downsampled data uniformly spaced in time by N/. omega. sub. s and positioned at n (N/. omega. sub. s) where n is the discrete downsampled time coordinate.
Analytical Instrument Optimum Data Acquisition Method And Apparatus
US Patent:
4070708, Jan 24, 1978
Filed:
Sep 1, 1976
Appl. No.:
5/719557
Inventors:
Stephen H. Smallcombe - Cupertino CA
Howard D. W. Hill - Cupertino CA
Howard D. W. Hill - Cupertino CA
Assignee:
Varian Associates, Inc. - Palo Alto CA
International Classification:
G06F 1534
US Classification:
364575
Abstract:
An analytical instrument employing ensemble averaging to improve the signal-to-noise ratio including means for determining the most efficient scaling factor and for controlling the instrument to maintain assurance of efficient averaging.
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