Adam C Moya, 3742 Campo Rd, Sedillo, NM 87059

6071476, Jun 6, 2000

Nov 14, 1997

8/970259

Daniel Young - Gurnee IL
Jeffrey Naber - Dearborn MI
Neil Adams - Novi MI
Edward Balko - Middletown NJ
Patrick Blosser - East Windsor NJ
Linda Hratko - Colonia NJ
Gerald Koermer - Roseland NJ
Jie Xue - Buffalo Grove IL
Adam Moya - Albuquerque NM
Chowdary Koripella - Albuquerque NM

Motorola, Inc. - Schaumburg IL
Engelhard Corp. - Iselin NJ

G01N 2520

422 51

A differential calorimetric gas sensor (10) which includes a sensing element (12) having a catalytic layer (14) disposed on a multi-layered substrate (26). Catalytic layer (14) includes an active catalyst region (14a) which oxidizes total combustibles within an exhaust gas stream and a reference catalyst region (14b) which oxidizes selective combustibles within the exhaust gas stream. An electrochemical oxygen source (18) is disposed on an opposite side of multi-layer substrate (26) from sensing element (12). An oxygen sensor cell (170) may be incorporated into electrochemical oxygen source (18). The multi-layered substrate (26) includes a plurality of overlaying insulating layers in which an intermediate layer (60) and a bottom layer (64) support primary heaters (58, 62), and in which another intermediate layer (52) supports compensation heaters (50a, 50b). The primary heaters (58, 62) function to maintain sensor (10) at a substantially constant temperature, while the compensation heaters (50a, 50b) function to restore temperature deviations determined by temperature-sensitive elements (46a, 46b) located on an inner layer (48) overlaying the compensation heaters (50a, 50b) resulting from the catalytic reactions taking place at the surfaces (34a, 34b) of the catalyst regions (14a, 14b). The control circuitry (300) operates to control the primary heater (58, 62) and the compensation heaters (50a, 50b), as well as to minimize the response variations of the temperature-sensitive elements (46a, 46b).

5795545, Aug 18, 1998

May 20, 1996

8/650705

Chowdary R. Koripella - Albuquerque NM
Adam D. Moya - Peralta NM
David Wilcox - Albuquerque NM

Motorola Inc. - Schaumburg IL

G01N 2522

422 94

A multilayered ceramic integrated sensor 200 for monitoring auto exhaust gases is capable of existing in the relatively harsh environments of the exhaust stream of an internal combustion engine. The integrated sensor 200 may include discrete devices such as an oxygen sensor 104, a hydrogen sensor 206, an NO. sub. x sensor 208, and a carbon monoxide sensor 210. The device 200 may further include a temperature sensor 202 as well as total combustion calorimetric sensor 102. The multilayered ceramic integrated sensor may be fabricated from a plurality of layers of ceramic material disposed in stacked relationship with respect to one another.

5989398, Nov 23, 1999

Nov 14, 1997

8/970837

Daniel A. Young - Gurnee IL
Adam Moya - Albuquerque NM
Chowdary R. Koripella - Albuquerque NM
Jeff Naber - Dearborn MI
Neil Adams - Novi MI
Craig Markyvech - Romulus MI
Adam Miller - Chicago IL

Motorola, Inc. - Schaumburg IL

G01N 2726
G01N 27419

204424

A calorimetric hydrocarbon gas sensor (10) includes an electrochemical oxygen pump (18), a sensing element (12), and a multi-layered substrate (26) separating the sensing element (12) from the electrochemical oxygen pump (18). The multi-layered substrate (26) includes a plurality of overlying insulating layers, in which at least one intermediate layer (60) supports a first primary heater (58), and in which another intermediate layer (52) supports a temperature compensation heaters (50a, 50b). The primary heater (58) functions to maintain the calorimetric hydrocarbon gas sensor (10) at a constant, elevated temperature, while the active compensation heater (50a) functions to maintain substantially equal temperatures as determined by the thermometers (46a, 46b) located on an intermediate layer (48) overlying the compensation heaters (50a, 50b). Control circuitry is integrated with power measurement circuitry to measure differences in the heat produced by the compensation heater (50a) and the thermometer (46a) in an active region (100), and the heat produced by the compensation heater (50b) and the thermometer (46b) in a reference region (102).