Timothy E Kelly

US Patent:

52510069, Oct 5, 1993

Filed:

Mar 7, 1991

Appl. No.:

7/666139

Inventors:

David E. Honigs - Laurel MD
Timothy G. Kelly - Silver Spring MD

Assignee:

NIRSystems Incorporated - Silver Spring MD

International Classification:

G01J 306
G01J 318

US Classification:

356319

Abstract:

In a spectrophotometer having an oscillating grating, an automatic calibration system is provided to ensure that the instrument constants are recomputed before each measurement of an unknown sample. In the system, whenever a reference scan is carried out, a second scan through an absorbance standard is carried out automatically and the data obtained is used to correct the instrument coefficients relating the angular position of the grating to the wavelength. The corrected coefficients are then stored to be used in the measurement of the unknown sample immediately thereafter. For near infrared spectrum measurements, the absorbance standard is a polystyrene plate. For visual measurements, the absorbance standard is a didymium plate. The didymium plate is mounted on the polystyrene plates eclipse a portion of the polystyrene plate.

US Patent:

43963854, Aug 2, 1983

Filed:

Dec 5, 1980

Appl. No.:

6/213353

Inventors:

Timothy G. Kelly - Silver Spring MD
David A. Lohr - Ellicott City MD
Peter A. St. John - Adelphi MD

Assignee:

Baxter Travenol Laboratories, Inc. - Deerfield IL

International Classification:

A61M 520

US Classification:

604152

Abstract:

Metering apparatus for controlling the flow of fluid through a fluid infusion system at an operator-designated rate includes a single-use cassette having a syringe-type pump in the flow system. The cassette is removably mounted on actuator apparatus which drives the syringe plunger through alternate fill and pump modes to advance fluid through the system. To provide compensation for the lack of flow in the system during fill strokes, the plunger is advanced at a higher compensation rate for first and second portions of the pump stroke immediately preceding and immediately following each fill stroke, with the pump stroke advancing at the designated rate therebetween. This results in an average flow rate which corresponds to the designated rate. By making the first and second compensations of equal duration, the effect of the fill cycles on the regularity of the average flow rate is minimized.