John E Dahlquist

US Patent:

54118069, May 2, 1995

Filed:

Oct 7, 1994

Appl. No.:

8/319933

Inventors:

John C. Dahlquist - Maplewood MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

B05D 306

US Classification:

4284111

Abstract:

The performance of phosphor screens can be improved by coating the phosphor dispersion/mixture onto a substrate while the dispersion/mixture contains less than 5% by weight of polymerizable components with a molecular weight less than 300, preferably with less than 5% by weight of polymerizable components having molecular weights less than 500. The polymerizable composition should be photopolymerizable, and other components within the coating to be photohardened which have molecular weights below 300 or 500 should likewise be kept to less than 5% by weight of the composition.

US Patent:

60278102, Feb 22, 2000

Filed:

Jun 9, 1997

Appl. No.:

8/871179

Inventors:

John C. Dahlquist - Maplewood MN
Subodh K. Kulkarni - Woodbury MN

Assignee:

Minnesota Mining & Manufacturing - St. Paul MN

International Classification:

G01J 158
B32B 118

US Classification:

428409

Abstract:

The performance of phosphor screens can be improved by adding an antistatic agent into the protective topcoat of the radiographic screen when the antistatic agent preferably comprises a fluorocarbon or silicone antistatic agent. These antistatic agents are particularly useful where the screen is made by coating phosphor dispersion/mixture onto a substrate while the dispersion/mixture contains less than 5% by weight of polymerizable components with a molecular weight less than 300, preferably with less than 5% by weight of polymerizable components having molecular weights less than 500, and a topcoat contains the antistatic agent. Formation of the antistatic topcoat is preferably formed by inclusion of the antistatic agent into the polymerizable composition and allowing the antistatic agent to migrate to the surface of the composition during polymerization to form a layer consisting essentially of the antistatic agent. The polymerizable composition should be photopolymerizable, and other components within the coating to be photohardened which have molecular weights below 300 or 500 should likewise be kept to less than 5% by weight of the composition.

US Patent:

56357184, Jun 3, 1997

Filed:

Jan 16, 1996

Appl. No.:

8/585507

Inventors:

James M. DePuydt - Stillwater MN
Nang T. Tran - Lake Elmo MN
James C. Brown - Brooklyn Center MN
Thomas J. Staiger - Hastings MN
John C. Dahlquist - Maplewood MN
Meredith J. Williams - San Jose CA

Assignee:

Minnesota Mining and Manufacturing Company - Saint Paul MN

International Classification:

G01T 124

US Classification:

25037009

Abstract:

A multi-module radiation detecting device, a radiation detecting module for incorporation in a multi-module radiation detecting device, and a method for assembling a multi-module radiation detecting device are provided. The radiation detecting module includes a carrier substrate and a radiation detecting tile mounted over the carrier substrate. The module includes interconnection structure for connecting radiation detecting elements in the radiation detecting tile to conductive contacts on a base substrate. The module facilitates attachment and detachment of the module relative to the base substrate and relative to a test fixture used in test and burn-in operations. The module is constructed to isolate the radiation detecting tile from thermal and/or mechanical stresses produced at the interconnection interface during attachment and detachment for test and burn-in, assembly, and rework operations. As a result, the module can be used to produce a multi-module radiation detecting device having enhanced reliability. The module can help maintain device reliability despite rework operations, and can thereby reduce rework costs.

US Patent:

55694853, Oct 29, 1996

Filed:

Oct 7, 1994

Appl. No.:

8/319812

Inventors:

John C. Dahlquist - Maplewood MN
Subodh K. Kulkarni - Woodbury MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

B05D 306

US Classification:

427 65

Abstract:

The performance of phosphor screens can be improved by adding an antistatic agent into the protective topcoat of the radiographic screen when the antistatic agent preferably comprises a fluorocarbon or silicone antistatic agent. These antistatic agents are particularly useful where the screen is made by coating phosphor dispersion/mixture onto a substrate while the dispersion/mixture contains less than 5% by weight of polymerizable components with a molecular weight less than 300, preferably with less than 5% by weight of polymerizable components having molecular weights less than 500, and a topcoat contains the antistatic agent. Formation of the antistatic topcoat is preferably formed by inclusion of the antistatic agent into the polymerizable composition and allowing the antistatic agent to migrate to the surface of the composition during polymerization to form a layer consisting essentially of the antistatic agent. The polymerizable composition should be photopolymerizable, and other components within the coating to be photohardened which have molecular weights below 300 or 500 should likewise be kept to less than 5% by weight of the composition.

US Patent:

55017550, Mar 26, 1996

Filed:

Feb 18, 1994

Appl. No.:

8/198614

Inventors:

John C. Dahlquist - Maplewood MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

B32B 3100

US Classification:

156153

Abstract:

A process for making an electrical interconnect comprising the steps of adhering a flexible electrical circuit to the surface of a substrate, building conductive posts on said flexible electrical circuit, putting a curable dielectric composition around said posts, and curing said composition.

US Patent:

54204526, May 30, 1995

Filed:

Oct 18, 1993

Appl. No.:

8/138622

Inventors:

Nang T. Tran - Cottage Grove MN
John C. Dahlquist - Maplewood MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

H01L 2714
H01L 2904
H01L 3106

US Classification:

257428

Abstract:

A radiation detection device includes a plurality of pixels, each pixel includes a thin film transistor and a photodiode conductively connected to a gate of the thin film transistor with the photodiode generating a current when the pixel is exposed to x-rays.

US Patent:

56077742, Mar 4, 1997

Filed:

May 15, 1995

Appl. No.:

8/441189

Inventors:

John C. Dahlquist - Maplewood MN
Mieczyslaw H. Mazurek - Roseville MN

Assignee:

Imation Corp. - Oakdale MN

International Classification:

B32B 2720

US Classification:

428447

Abstract:

The present invention describes a method for the manufacture of a phosphor intensifying screen which eliminates the use of solvents and high processing temperatures. The method comprises blending a phosphor in a hardenable system (i. e. , that is, as defined herein, a polymerizable or curable system) comprising phosphor in a radiation curable binder composition, coating the phosphor in a radiation curable binder composition onto a substrate, and polymerizing (i. e. , hardening) the system by exposure to actinic radiation. The radiation curable binder composition comprises an organopolysiloxane or a mixture of organgpolysiloxanes.

US Patent:

55209653, May 28, 1996

Filed:

Oct 7, 1994

Appl. No.:

8/319807

Inventors:

John C. Dahlquist - Maplewood MN
Mieczyslaw H. Mazurek - Roseville MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

C08J 764
B05D 512

US Classification:

427515

Abstract:

The present invention describes a method for the manufacture of a phosphor intensifying screen which eliminates the use of solvents and high processing temperatures. The method comprises blending a phosphor in a hardenable system (i. e. , that is, as defined herein, a polymerizable or curable system) comprising phosphor in a radiation curable binder composition, coating the phosphor in a radiation curable binder composition onto a substrate, and polymerizing (i. e. , hardening) the system by exposure to actinic radiation. The radiation curable binder composition comprises an organopolysiloxane or a mixture of organopolysiloxanes.