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| Number | Title | Issue Date |
| 5498104 | Leaching chamber A leaching chamber for burial in the ground includes non-symmetrical corrugations extending laterally across the leaching chamber. Each corrugation has a ridge and a shoulder with the ridge being higher than the shoulder and sloping down from the ridge to... | 03/12/1996 |
| 5441363 | Leaching chamber A leaching chamber for burial in the ground includes non-symmetrical corrugations extending laterally across the leaching chamber. Each corrugation has a ridge and a shoulder with the ridge being higher than the shoulder and sloping down from the ridge to... | 08/15/1995 |
| 5336017 | Leaching system conduit with interlocking end joint A conduit for dispersing or gathering liquids in the earth has an arch shape cross section and alternating peak and valley corrugations along its length, with cantilever legs extending from one end to interact with the mating portion of a like conduit. Th... | 08/09/1994 |
| 5156488 | Leaching system conduit with sub-arch A conduit for dispersing or gathering liquids in the earth has an arch shape cross section and alternating peak and valley corrugations along its length. At one end of the conduit is a sub-arch for receiving a pipe. In one embodiment there is a discontinu... | 10/20/1992 |
| 5087151 | Drainage system In septic systems for handling household waste water or in clear water drainage applications, lightweight molded polyethylene galleries are used to form the drain field. The galleries can be axially aligned in end-to-end relationship with each gallery def... | 02/11/1992 |
| 5063100 | Moisture-impervious panel capable of delayed, rapid hydration including water channels filled with water-removal material A panel, and method of making the panel, useful as a water barrier including an intermediate layer of a water-swellable colloidal clay, such as bentonite, sandwiched between two layers of sheet material, such as paperboard, wherein at least one of the she... | 11/05/1991 |
| 5053265 | Moisture-imprevious panel capable of delayed hydration A flexible or rigid panel, and method of making the panel, useful as a water barrier including an intermediate layer of a water-swellable colloidal clay, such as pentonite, sandwiched between two layers of sheet material, such as woven or non-woven fabric... | 10/01/1991 |
| 5017041 | Leaching system conduit with high rigidity joint A conduit for dispersing or gathering liquids in the earth has an arch shape cross section and alternating peak and valley corrugations along its length. A more rigid shiplap joint is formed between mating conduits by means of cantilever legs extending fr... | 05/21/1991 |
| 4950103 | Corrugated drainage tube A drainage tube includes alternating annular peaks and annular valleys on an exterior wall of the tube. An interior wall of the tube is smooth and continuous along its length. The combined exterior wall and interior wall form an elongated tube. In alterna... | 08/21/1990 |
| 4930936 | Partial-seepage drainage pipe with mating sleeve A partial-seepage drainage pipe includes a wall surface of circular profile which is corrugated over the majority of the pipe circumference. Adjoining the circular wall surface is a base having a bottom surface and side wall segments. The pipe has a matin... | 06/05/1990 |
| 4904113 | Highway edgedrain A hydraulic structure is provided in the form of a flexible, flat, corrugated plastic tube having a relatively oblongated cross-section, with apertures associated with the grooves of the corrugation. The tube is enclosed in a geotextile sheath. The two re... | 02/27/1990 |
| 4824287 | Septic system In a septic system for handling household waste water, used vehicle tires are employed to form the septic tank and the leaching galleries. Vehicle tires sealed to one another and in combination with end caps provide a watertight and lighttight enclosure i... | 04/25/1989 |
| 4795555 | Molded block arrangement for a ground covering for composting waste purification A molded-block arrangement is disclosed for a ground covering for the production of humus by means of composting for producing soil from sewage sludge for the purification of waste-water and waste-gas, and the like. Molded blocks are provided with groove-... | 01/03/1989 |
| 4759661 | Leaching system conduit A thermoplastic device for leaching sewage system effluent into the earth has the shape of an inverted trough. Its sidewalls have slot shaped perforations; above each slot is a lip; beneath each slot is one or more protuberances, preferably rectanguloid i... | 07/26/1988 |
| 4624603 | Underground drain pipe An underground drain pipe having an improved soil pressure resisting strength. A main portion of the pipe is constituted by a generally U-shaped strengthening member. The strengthening member is wound in a spiral with the open sides thereof directed inwar... | 11/25/1986 |
| 4523613 | Multi-layered corrugated conduit with "black-eye" like apertures The conduit includes a top wall (A) and a base (B). The top wall A has an apex area (10) which is connected with a first corrugated side wall (12) and a second corrugated side wall (32). The side walls having alternating peaks (22, 42) and valleys (24, 44... | 06/18/1985 |
| 4490072 | Drainage device The drainage device includes a stiff plastic core having rigid raised portions and valleys therebetween is oriented vertically and tangentially to a drain pipe which has axially spaced raised annular portions contacting the core and annular recesses with ... | 12/25/1984 |
| 4451172 | Open top drain A corrugated metal open top pipe drain for the collection and removal of surface water from paved areas, such as highways, parking lots, airports and the like.... | 05/29/1984 |
| 4360042 | Arched conduit with improved corrugations A foldable conduit has a generally parabolic arched portion and a flat base. The arched portion comprises a pair of corrugated side walls which are connected with a hinge. The corrugations comprise alternating peak portions and valley portions. Each peak ... | 11/23/1982 |
| 4245924 | Arch conduit Disclosed is a foldable arched conduit suitable for use as drain tubing, culverts and the like. The conduit has the cross section of a parabolic arch with a flat base. The arched portion of the conduit comprises a pair of rigid corrugated plastic walls jo... | 01/20/1981 |
| 4204967 | Tubewell screen filters A tubewell screen filter includes a core tube with apertures distributed along its length and a support structure which provides distributed support for a fine mesh filter screen with an open area of at least 12%. The support structure has helical channel... | 05/27/1980 |
| 4182581 | Pipe for underdraining A pipe for underdrainage comprises (1) a liquid-collecting pipe; (2) a plurality of discontinuous protrusions on the outer surface of the liquid-collecting pipe; (3) a filter layer capable of passing liquid while substantially excluding solids, the filter... | 01/08/1980 |
| 4182580 | Underdrainage pipe An underdrainage pipe comprises a liquid-collecting pipe, protrusions on the liquid-collecting pipe, a filter layer around the liquid-collecting pipe and a liquid-conducting way, and the protrusions having at least one recess for each and the bottom porti... | 01/08/1980 |
| 4163619 | Corrugated drainage tubing with helically arranged drainage openings A thermoplastic corrugated drainage tube comprising annular peaks and valleys and a plurality of drainage openings internally cut about the circumference of each valley, the openings in each valley aligned with the openings in successive valleys along hel... | 08/07/1979 |
| 4140422 | Plastic corrugated drainage pipe A corrugated plastic drainage pipe in which drainage holes are formed through raised reinforcing formations on the corrugated pipe periphery and in which each of the reinforcing formations is integrally joined to adjacently disposed ridges or ribs of the ... | 02/20/1979 |
| 4113818 | Drain pipe method A drain pipe of corrugated form comprising corrugations of uniform inner diameter having axially in line alternating drain holes and outward protrusions in the corrugation troughs. The drain holes are cut by a stationary knife which engages the troughs of... | 09/12/1978 |
| 4061368 | Coupling for spiral drain pipe A coupling for joining spiral underground drainage pipes includes a cylinderical body with an inner circumferential flange and locking projections. When the coupling is rotated on to the drainage pipes the ends of the pipes are held flush on the flange an... | 12/06/1977 |
| 4039105 | Fertilizer dispenser A fertilizer dispenser associated with an ordinary garden hose, the dispenser being adapted to introduce under suitable conditions other materials such as fertilizers, soap powders and fire extinguishing chemicals. The desideratum is a uniform mixture of ... | 08/02/1977 |
| 4006599 | Plastic drain pipe and apparatus for producing the same A synthetic plastic drain pipe comprising a continuous pipe of plastic material having transverse, angular or helical corrugations, said pipe having openings for the entry of water, said openings being disposed in said pipe at regular repeating intervals ... | 02/08/1977 |
| 3976578 | Protective sleeve for corrugated drainage tubes A continuous tubular sleeve of knit fabric material, which is cylindrical in shape and, in the relaxed condition, of a diameter less than the diameter of the corrugated drainage pipe to which it is to be applied, is formed in lengths up to approximately 1... | 08/24/1976 |
| 3958425 | Corrugated plastic drainage pipe with integral coupler A corrugated plastic drainage pipe having a coupler integrally formed at one end thereof and wherein the coupler is in the form of an enlarged collar having an inner diameter and length so as to receive the end of a connecting pipe therein and having a pl... | 05/25/1976 |
