ARNOLD HENRY PLOWMAN
Pilots at 3 St, Willmar, MN
License number
Minnesota A3670778
Issued Date
May 2016
Expiration Date
May 2018
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
1500 3Rd St NE, Willmar, MN 56201
Professional information
Modular Drainage Tube Construction System
US Patent:
5458436, Oct 17, 1995
Filed:
Jun 29, 1994
Appl. No.:
8/267650
Inventors:
Jeffrey D. Plowman - Prinsburg MN
Arnold H. Plowman - Willmar MN
Arnold H. Plowman - Willmar MN
Assignee:
Multi-Flow Tube, Inc. - Prinsburg MN
International Classification:
E02B 1100
US Classification:
405 36
Abstract:
A modular junction fitting system for joining ends of two or more lengths of edge-type drainage robing (being of the type that is substantially taller than it is wide in transverse cross-section). The junction fitting of the invention includes a central generally vertically oriented tube that is substantially taller than it is wide, side walls having, for each edge-type drainage tube to be connected to such fitting, one or more orifices for permitting fluid communication of the drainage tubing with the interior of the central tube. A connector is provided for connecting the edge-type drainage tubing to the central vertical tube in alignment with the orifices. The system can utilize simple mechanical attachments between the drain tubing, the connector, and the central tube, permitting easy fabrication of a wide variety of fittings, thus permitting the system to be used in a wide variety of configurations.
Drainage Tube Construction
US Patent:
4995759, Feb 26, 1991
Filed:
Nov 4, 1988
Appl. No.:
7/267969
Inventors:
Jeffrey D. Plowman - Prinsburg MN
Arnold H. Plowman - Willmar MN
Arnold H. Plowman - Willmar MN
Assignee:
Multi-Flow Tube, Inc. - Prinsburg MN
International Classification:
E02B 1100
US Classification:
405 43
Abstract:
A ground drainage system includes a relatively narrow, elongated trench disposed along a roadway (or agricultural field); and a drainage tube construction disposed in the trench. The tube construction including a plurality of longitudinally extending, substantially tangential and generally parallel corrugated tubes oriented with respect to one another in a linear fashion. In transverse cross-section the portions attaching the tubes to another define a generally straight line perpendicular to the longitudinal dimension of the tubes. The tubes are generally vertically stacked with respect to one another. The corrugations are defined by alternating ribs and valleys. Each tube has perforations in the valleys to allow fluid to enter therein and be drained away.