John C Drenter

US Patent:

8106369, Jan 31, 2012

Filed:

Mar 10, 2009

Appl. No.:

12/401269

Inventors:

John Drenter - Davenport IA, US

Assignee:

PCT Engineered Systems, LLC - Davenport IA

International Classification:

B05D 3/06

US Classification:

2504923, 2505151

Abstract:

The present disclosure includes an electron beam emitter, a roller for a web, circumferential radiation shielding, a reaction chamber, movement between open and closes positions, a depositor, baffles, inert gas dispenser, and other features. One example in the present disclosure is a web carrying roller for electron beam irradiation of the web on one side of that roller within a baffle-containing shielded area, while another side of that roller is outside of the shielded area, and near the two ends of the roller are arcuate tongue and groove barriers to x-radiation leakage from the shielded area. The baffle-containing shielded area has a series of voids separated by walls, rather than having the shielded area positioned close to the circumference of the cylinder along its length.

US Patent:

55202888, May 28, 1996

Filed:

Mar 21, 1994

Appl. No.:

8/215280

Inventors:

John C. Drenter - Davenport IA
Donald C. Allebach - Davenport IA
Dieter A. Konitzer - Walcott IA

Assignee:

PCT, Inc. - Davenport IA

International Classification:

B03C 100

US Classification:

209221

Abstract:

A mobile apparatus and process for the separation and recovery of abrasive grit material from blasting material containing waste material and contaminants. The mobile apparatus has a low profile which facilitates the movement of the apparatus to job sites. At the job site the blasting material is collected by the mobile apparatus through a flexible hose connected to a chamber which is under sub atmospheric pressure. A vacuum generator that reduces the pressure in the chamber has sufficient power to allow vacuum collection of the blasting material through the flexible hose when material flow might otherwise clog the hose. The abrasive grit material is removed from the blasting material by a self-contained, multi-step separation process situated within the chamber. The mobile apparatus utilizes an initial physical separator, a rotary screen separator, a magnetic separator, and an air wash separation device that are interconnected by a rotary lift wheel. The substantially pure abrasive grit material must pass through an airlock in order to exit the chamber during the recovery process.

US Patent:

61528102, Nov 28, 2000

Filed:

Jul 6, 1998

Appl. No.:

9/110610

Inventors:

John C. Drenter - Davenport IA

Assignee:

PCT, Inc. - Davenport IA

International Classification:

B24C 300

US Classification:

451 75

Abstract:

An apparatus for the introduction of a blasting media into a high velocity, high pressure fluid stream. In one embodiment of the present invention a dual chambered pressure vessel has a pair of auxiliary actuated pop-up valves that are cycled at a high rate to provide continuous delivery of the blasting media to the work surface. The pressure vessel having a blasting media flow control valve coupled with the pressure vessel for controlling the flow of blasting media into the vessel.

US Patent:

56578768, Aug 19, 1997

Filed:

Jun 7, 1995

Appl. No.:

8/472408

Inventors:

John Charles Drenter - Davenport IA
Donald Charles Allebach - Davenport IA
Dieter Artur Konitzer - Walcott IA

Assignee:

PCT, Inc. - Davenport IA

International Classification:

B03C 100

US Classification:

2092231

Abstract:

A mobile apparatus and process for the separation and recovery of abrasive grit material from blasting material containing waste material and contaminants. The mobile apparatus has a low profile which facilitates the movement of the apparatus to job sites. At the job site the blasting material is collected by the mobile apparatus through a flexible hose connected to a chamber which is under sub atmospheric pressure. A vacuum generator that reduces the pressure in the chamber has sufficient power to allow vacuum collection of the blasting material through the flexible hose when material flow might otherwise clog the hose. The abrasive grit material is removed from the blasting material by self-contained, multi-step separation process situated within the chamber. The mobile apparatus utilizes an initial physical separator, a rotary screen separator, a magnetic separator, and an air wash separation device that are interconnected by a rotary lift wheel. The substantially pure abrasive grit material must pass through an airlock in order to exit the chamber during the recovery process.

US Patent:

56222653, Apr 22, 1997

Filed:

Jun 7, 1995

Appl. No.:

8/482445

Inventors:

John C. Drenter - Davenport IA
Donald C. Allebach - Davenport IA
Dieter A. Konitzer - Walcott IA

Assignee:

PCT, Inc. - Davenport IA

International Classification:

B03C 100

US Classification:

209221

Abstract:

A mobile apparatus and process for the separation and recovery of abrasive grit material from blasting material containing waste material and contaminants. The mobile apparatus has a low profile which facilitates the movement of the apparatus to job sites. At the job site the blasting material is collected by the mobile apparatus through a flexible hose connected to a chamber which is under sub atmospheric pressure. A vacuum generator that reduces the pressure in the chamber has sufficient power to allow vacuum collection of the blasting material through the flexible hose when material flow might otherwise clog the hose. The abrasive grit material is removed from the blasting material by a self-contained, multi-step separation process situated within the chamber. The mobile apparatus utilizes an initial physical separator, a rotary screen separator, a magnetic separator, and an air wash separation device that are interconnected by a rotary lift wheel. The substantially pure abrasive grit material must pass through an airlock in order to exit the chamber during the recovery process.

US Patent:

20220285120, Sep 8, 2022

Filed:

Mar 5, 2021

Appl. No.:

17/249558

Inventors:

- Davenport IA, US
John Charles Drenter - Davenport IA, US
Paul Michael Fletcher - Chelmsford MA, US

Assignee:

PCT Ebeam and Integration, LLC - Davenport IA

International Classification:

H01J 35/06
H01J 35/08
H01J 35/18

Abstract:

An x-ray apparatus includes a vacuum chamber that includes a window for exit of x-rays. Electrons are generated at a cathode within the vacuum chamber and accelerated toward a target anode associated with the window. An x-ray generating layer is included as a surface of the target anode to receive the electrons emitted by the cathode and to create x-rays. A blocking path blocks over 70% of the free electrons reaching said target anode from continuing on to exit through the window, while allowing x-rays leaving the x-ray generating layer to continue along the selectively blocking path to exit through the window. The x-ray apparatus is capable of operating at low voltage and relatively high power to reduce the necessary shielding and the corresponding weight of the apparatus yet allow more ready absorption of x-rays by items being irradiated.

US Patent:

20160093410, Mar 31, 2016

Filed:

Sep 30, 2014

Appl. No.:

14/501815

Inventors:

- Davenport IA, US
John Charles Drenter - Davenport IA, US

International Classification:

G21F 3/00
G21K 5/02

Abstract:

Apparatus for electron beam treatment of three-dimensional parts that includes cavities in a shielded rotating drum that preferably includes additional rotation mechanism for rotating parts within cavities in said drum. Radiation associated with the electron beam emitter is substantially shielded by the combination of the drum and the additional radiation shielding. The rotating drum is preferably made of at least four sections axially stacked, and its shielding properties are enhanced by including lead filled holes drilled in the sections.