Gerald Allen Keller

US Patent:

52215962, Jun 22, 1993

Filed:

Sep 3, 1991

Appl. No.:

7/753461

Inventors:

Gerald A. Keller - Chandler AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G03C 500

US Classification:

430324

Abstract:

A retrograde profile is formed in a photoresist layer (11, 20) by modifying the rate at which a photoresist developer solution dissolves a portion (12) of a photoresist layer (11, 20). The photoresist layer (11, 20) is exposed to a chemical such as hexamethyldisilizane or dimethylsulfoxane to allow a portion (12) of the photoresist (11, 20) to absorb the chemical. The photoresist (11, 20) is then heated in order to enhance a reaction between the photoresist (11, 20) and the chemical. The reaction modifies a portion (12) of the photoresist (11, 20) to reduce the rate at which the portion (12) of the photoresist (11, 20) is dissolved by a developer solution.

US Patent:

43217974, Mar 30, 1982

Filed:

Apr 14, 1980

Appl. No.:

6/139998

Inventors:

Ronald J. Yaeger - Dallas TX
Gerald W. Keller - Dallas TX

Assignee:

Air & Refrigeration Corp. - Dallas TX

International Classification:

F25B 700
F25B 2702

US Classification:

62 79

Abstract:

A waste heat recovery system for use with refrigeration means and a hot water reservoir is disclosed. The system is intended for use with refrigeration means of the type including a compressor and a condenser through which a compressible refrigerant is circulated. The system includes a heat exchanger having a refrigerant passage and a water passage mutually coupled in heat exchange relation. A heat exchange circulation conduit connects the water passage of the heat exchanger in fluid communication with the hot water reservoir to permit water to be circulated from the reservoir to the heat exchanger and return. A precharged refrigerant conduit connects the outlet port of the compressor in fluid communication with the condenser and includes a pair of bypass conduit sections terminated by quick connect/disconnect coupling members for connection to the refrigerant passage of the heat exchanger. A shut-off valve is connected in series fluid circuit relation in the refrigerant conduit intermediate the upstream and downstream bypass sections. The refrigerant passage of the heat exchanger is also precharged and includes inlet and outlet conduit sections having complementary quick connect/disconnect coupling members for engagement with the corresponding quick connect coupling members of the bypass conduit sections.

US Patent:

43163670, Feb 23, 1982

Filed:

Oct 6, 1978

Appl. No.:

5/949083

Inventors:

Ronald J. Yaeger - Dallas TX
Gerald W. Keller - Dallas TX

International Classification:

F25B 2702
F25B 1300

US Classification:

622386

Abstract:

A heat recovery and hot water circulation system for use with refrigeration means and a hot water reservoir is disclosed. A hot water distribution conduit is coupled intermediate the cold water inlet and hot water outlet of the reservoir for supplying hot water to a remote station having a number of faucets coupled to the distribution conduit, and a pump is coupled to the distribution conduit for continuously circulating hot water to the faucets. A heat exchange circulation conduit is connected in parallel fluid circuit relation with the distribution conduit and in series fluid circuit relation with the pump. A heat exchanger couples the hot water reservoir to the compressor by means of its refrigerant passage and water passage which are mutually coupled in heat exchange relation, the refrigerant passage being connected in fluid communication with the discharge outlet of the compressor, and the water passage being coupled to the hot water reservoir by means of a heat exchange circulation conduit which permits water to be circulated from the reservoir through the heat exchanger. Valve means are connected in series fluid circuit relation with the heat exchange circulation conduit and is responsive to the operation of the compressor and to the temperature of the water circulated through the heat exchanger for permitting the circulation of water through the heat exchange conduit when the compressor is operating and the temperature of water circulated through the heat exchanger is less than a predetermined level, for example 160. degree. F. , and for preventing the circulation of water through the heat exchange circulation conduit when the temperature of the water exceeds the predetermined level or when the compressor is not operating.

US Patent:

54478740, Sep 5, 1995

Filed:

Jul 29, 1994

Appl. No.:

8/282360

Inventors:

Gordon Grivna - Mesa AZ
Bruce A. Bernhardt - Chandler AZ
Gerald Keller - Chandler AZ

International Classification:

H01L 21338

US Classification:

437 40

Abstract:

A method of manufacturing a semiconductor device gate is provided that reduces gate length variability while maintaining self-alignment and eliminating etch damage and substrate contamination. A gate opening (18) is formed in an oxide layer (16) using a anisotropic etch. The anisotropic etch creates a reverse gate metal image that has low gate length variability. Dual metal gate (26) is then deposited. The excess gate metal is then removed and the top surface (31) of the gate (30) planarized using a chemical mechanical polish. The remaining oxide (16) is then removed, leaving a precise gate (30). The use of a nitride barrier (12) and of an etchstop layer (14) of aluminum nitride under the oxide layer (16) is also shown.

US Patent:

42266068, Oct 7, 1980

Filed:

Oct 6, 1978

Appl. No.:

5/949084

Inventors:

Ronald J. Yaeger - Dallas TX
Gerald W. Keller - Dallas TX

Assignee:

Air & Refrigeration Corp. - Irving TX

International Classification:

F25B 2702
F25B 1300

US Classification:

62238

Abstract:

A waste heat recovery system for use with refrigeration means and a hot water reservoir is disclosed. The system is intended for use with refrigeration means of the type including a compressor and a condenser through which a compressible refrigerant is circulated. The system includes a heat exchanger having a refrigerant passage and a water passage mutually coupled in heat exchange relation. A heat exchange circulation conduit connects the water passage of the heat exchanger in fluid communication with the hot water reservoir to permit water to be circulated from the reservoir to the heat exchanger and return. A fluid flow restrictor is connected in series fluid circuit relation intermediate the compressor discharge outlet and the condenser for producing a pressure differential. The refrigerant passage of the heat exchanger is connected in parallel fluid circuit relation with the fluid flow restrictor. The pressure differential created by the fluid flow restrictor causes flow of high pressure heated refrigerant vapor through the refrigerant passage for heat exchange purposes.