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David W. Presby Patents
Inventor:
Presby; David W.
Address:
Sugar Hill, NH
No. of patents:
10
Patents:




Patent Number Title Of Patent Date Issued
7288190 Method, apparatus and system for removal of contaminants from water October 30, 2007
Disclosed is a water de-contamination system, methods, and apparatus using alternating aerobic, anaerobic, and aerobic conditions, with carbon and other waste processing treatments, to remove contaminants from water. Included is an aerobic system in flow communication with an outlet from
7270532 Skimmer tab former September 18, 2007
Systems for leaching liquid waste, particularly waste water. More particularly, a cylindrical conduit or pipe for use in leaching systems. Even more particularly, a cylindrical conduit which has apertures/skimmer tabs created either during the manufacture/forming/extrusion of the con
6899359 Means for coupling conduit May 31, 2005
Couplers for coupling conduit in end-to-end flow communication relationship are disclosed. A coupler has at least two coupling members each having one end hingingly attachable to one end of another of the at least two coupling members, and one of each coupling members having one end
6792977 End cap for a corrugated conduit September 21, 2004
An end cap for a corrugated conduit, attachable to the open end of conduit preferrably corrugated conduit. The end cap has a cylindrical skirt portion and an end piece, a plurality of inwardly-directed latching tabs spaced around the cylindrical skirt portion and which are springingly
6461078 Plastic sewage pipe October 8, 2002
Systems for leaching liquid waste, particularly waste water. More particularly a cylindrical conduit or pipe for use in leaching systems. The pipe further has axially directed cuts or apertures in conduit/pipe valleys, has ridges, channels and grooves over which may be laid either si
6290429 Multi-level leaching system September 18, 2001
The invention most fundamentally is a leaching system substantially consisting of subsystems of liquid permeable conduit, serial or parallel interconnected for the serial or parallel flow of fluid being processed. Fluid flow is within subsystems and between subsystems from one level to
5954451 Multi-layer material for processing septic efficient and waste water and method of using the sam September 21, 1999
A device/apparatus for using a multilayer fabric of varying deniers for the processing and treatment of fluids which must be treated to remove materials so that the resultant treated fluid may be reused and/or returned to the earth and particularly to the water table. More particular
5606786 Apparatus and method for producing pipe and pipe produced thereby March 4, 1997
An apparatus and method for perforating corrugated plastic pipe from the inside of the pipe to the outside and the pipe produced by the method. The apparatus has a perforating device attached to an elongated support member. Perforations are created by advancing pipe over the perforating
5429752 Means for precipitating out suspended solids in septic tank liquids July 4, 1995
This invention most generally relates to a method of and a device/apparatus for use in precipitating out suspended solids, particularly those found in septic tanks, and having the particular objectives, features and advantages of: 1) Special formed collection and support structure which
4373285 Gun muzzle loader February 15, 1983
A loading device and method for loading a muzzle loading gun. The device comprises an elongated attachment with a longitudinal bore across which is placed a frangible septum. The bore above the system is loaded with a premeasured powder charge and a projectile with wadding (if necessary)


 
 
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