USRE29394E - Corrosion protective band for underground pipe joints with metal parts - Google Patents
Corrosion protective band for underground pipe joints with metal parts Download PDFInfo
- Publication number
- USRE29394E USRE29394E US05/654,228 US65422876A USRE29394E US RE29394 E USRE29394 E US RE29394E US 65422876 A US65422876 A US 65422876A US RE29394 E USRE29394 E US RE29394E
- Authority
- US
- United States
- Prior art keywords
- band
- spigot
- bell
- joint
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005260 corrosion Methods 0.000 title abstract description 7
- 230000007797 corrosion Effects 0.000 title abstract description 7
- 239000002184 metal Substances 0.000 title abstract description 6
- 230000001681 protective effect Effects 0.000 title 1
- 239000011398 Portland cement Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 10
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 8
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000004567 concrete Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 2
- 230000001413 cellular effect Effects 0.000 claims 2
- 238000000151 deposition Methods 0.000 claims 2
- 239000000126 substance Substances 0.000 claims 2
- 239000000919 ceramic Substances 0.000 claims 1
- 239000000565 sealant Substances 0.000 abstract description 2
- 238000009736 wetting Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 18
- 238000000034 method Methods 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- 229920001971 elastomer Polymers 0.000 description 7
- 239000011440 grout Substances 0.000 description 4
- 239000006260 foam Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 229920001247 Reticulated foam Polymers 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000011513 prestressed concrete Substances 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920005594 polymer fiber Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/0027—Joints for pipes made of reinforced concrete
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
- F16L58/185—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for joints with sleeve or socket
Definitions
- This invention relates to underground pipes or conduits. It relates particularly to joints in underground pipes having metallic parts and to protection of such joints from corrosion.
- the lengths of the pipe are placed in an open trench with a spigot end of one length fitted into a bell end of an adjoining length.
- One such type of underground pipe is made of reinforced or prestressed concrete fitted with a steel bell ring at one of its ends and a steel spigot ring at its other end.
- the spigot ring has an annularly formed groove into which is positioned a rubber gasket.
- a diaper-like form of burlap or the like (and generally referred to as a "diaper") then is applied around the joint and Portland cement grout is poured therein.
- this method of joint protection offers an excellent means of assuring long-term protection of the joint.
- both field and laboratory experiments have shown that there has been a lack of proper workmanship in using the method, with the result that the full value of this method has not been realized. In part this lack is due to difficulty involved in proper practice of the method and in part to inability of providing foolproof inspection of the joint prior to its burial.
- Another disadvantage of protecting the joint with mortar poured into a diaper is excessive cost.
- a contractor is obliged to use at least one extra man performing the operation even in the smallest of pipe sizes.
- a larger crew is needed together with necessary mixing and logistical support equipment.
- a further disadvantage is a requirement that excavated trenches which fill with water, generally percolating in from surrounding soil, must be dewatered prior to placement of the diaper and pouring of the grout.
- Yet another disadvantage of this method is a difficulty that grout pouring crews have in maintaining a proper sequence of trenching, pipe joining and backfilling. It is usual, therefore, to have excessively long lengths of open trenches with exposed joints being readied for grouting. Long lengths of open trenches pose hazards to the public and present an unsightly appearance.
- a dry spigot band is placed over the spigot and onto the metal spigot ring.
- the spigot band is elastic, flexible and made preferably of a reticulated polyurethane foam which is impregnated with a cement such as Portland cement.
- a cement such as Portland cement.
- FIG. 1 is a partial vertical sectional view of a rubber and steel pipe connection for a reinforced concrete pipe joint with metal bell and spigot rings spaced apart from each other.
- FIG. 2 is the same as FIG. 1 with the spigot engaged into the bell.
- FIG. 3 is a perspective view of a spigot band according to this invention and applied to a metal spigot ring.
- FIG. 4 is a sectional view of a reticulated foam spigot band according to this invention.
- FIG. 5 is a sectional view of the reticulated foam spigot band encased in a fabric sheath.
- pipes 11 and 12 generally are made of reinforced concrete or prestressed concrete and are fitted respectively with a steel bell ring 13 and a steel spigot ring 14 at their respective ends.
- the spigot ring 14 has an annularly formed groove 16 into which is positioned a rubber gasket 17.
- the rubber gasket 17 is compressed in the spigot ring groove 16 by an inside annular face 18 of the bell ring 13, thus effecting a watertight seal therebetween.
- the spigot band 21 is stretched and pulled over the steel spigot ring 14 as shown in FIG. 1.
- the bell band 19 preferably is connected to the pipe 11 by means of a suitable adhesive.
- the outer and inner portions of the joint have the spigot band 21 and bell band 19 positioned respectively to protect the steel bell and spigot rings 13, 14.
- the Portland cement (or other particulate alkaline material) impregnated therein is hydrated, thereby activating its alkalinity and corrosion inhibiting properties.
- the fluid in the pipeline activates the corrosion inhibiting properties of the bell band 19.
- reticulated or network form such as felt, wool.[.,.]. polymer fibers or open celled polymers; may be used to make bands 19, 21.
- Usable polymers include vinyl, butadiene, styrene, urethane polymers, and the like. Foamed polyurethane is preferred.
- the reticulated polyurethane foam used in the gasket is about 1 by 2 inches in cross section and has about 45 pores per square inch of surface. This polyurethane foam is seen in FIG. 4 and its cross-section carries about 5.5 ounces of Portland cement per linear foot. The foam can hold larger amounts of Portland cement, but such additional amounts of Portland cement do not increase effectiveness of the method of the present invention.
- the foam band may be surrounded by a water-soluble water-permeable member 22 as shown in FIG. 5 to reduce cement loss during shipping and placing, yet allowing water to pass through it for hydrating the Portland cement.
- Portland cement is believed to be the most effective and economical of such cements.
- the materials for the band are all commercially available.
- Reticulated polyurethane foam for example, is manufactured by the Scott Paper Company's Foam Division in Chester, Pa.
- the Portland cement is conventional and is available widely.
- a non-woven polyester fabric for sheath 22 is obtainable from a wide variety of suppliers. All the separate materials are assembled by a fabricator skilled in the art of commercial textile production.
- Each band preferably is packed individually in a waterproof plastic bag so as to avoid premature hydration of the Portland cement.
- a number of such bags are packaged into a cardboard container and the container is shipped to the field.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints With Sleeves (AREA)
Abstract
A system of protecting pipes with bell and spigot joints (having metal parts) from corrosion .[.be.]. .Iadd.by .Iaddend.fitting between the spigot and bell at least one dry band of open celled material (preferably reticulated polyurethane foam) having a hydratable cement (preferably Portland cement) impregnated therein and engaging the band between the bell and the spigot. On wetting of the band, the cement is hydrated to form a water impervious hard sealant in the joint which releases alkalinity to protect the metal.
Description
This is a continuation-in-part application with respect to copending U.S. patent application Ser. No. 359,967 filed May 14, 1973 .Iadd.and now U.S. Pat. No. 3,909,010.Iaddend..
This invention relates to underground pipes or conduits. It relates particularly to joints in underground pipes having metallic parts and to protection of such joints from corrosion. In the usual practice of laying pipes .[.for.]. .Iadd.of .Iaddend.underground service, the lengths of the pipe are placed in an open trench with a spigot end of one length fitted into a bell end of an adjoining length. One such type of underground pipe is made of reinforced or prestressed concrete fitted with a steel bell ring at one of its ends and a steel spigot ring at its other end. Generally the spigot ring has an annularly formed groove into which is positioned a rubber gasket. When the spigot containing the gasket is inserted into the next bell, the rubber gasket is compressed between the spigot groove and an inside annular face of the bell, thus effecting a joint with a watertight seal. Because of necessity of providing this means of joining and compressing the gasket, adjacent portions of the bell and spigot ring necessarily are exposed and may be subjected to corrosive influences depending upon character of enveloping soil and moisture.
A diaper-like form of burlap or the like (and generally referred to as a "diaper") then is applied around the joint and Portland cement grout is poured therein. When installed properly, this method of joint protection offers an excellent means of assuring long-term protection of the joint. However, both field and laboratory experiments have shown that there has been a lack of proper workmanship in using the method, with the result that the full value of this method has not been realized. In part this lack is due to difficulty involved in proper practice of the method and in part to inability of providing foolproof inspection of the joint prior to its burial.
Another disadvantage of protecting the joint with mortar poured into a diaper is excessive cost. A contractor is obliged to use at least one extra man performing the operation even in the smallest of pipe sizes. For larger sizes a larger crew is needed together with necessary mixing and logistical support equipment. A further disadvantage is a requirement that excavated trenches which fill with water, generally percolating in from surrounding soil, must be dewatered prior to placement of the diaper and pouring of the grout. Yet another disadvantage of this method is a difficulty that grout pouring crews have in maintaining a proper sequence of trenching, pipe joining and backfilling. It is usual, therefore, to have excessively long lengths of open trenches with exposed joints being readied for grouting. Long lengths of open trenches pose hazards to the public and present an unsightly appearance.
It is accordingly an object of the present invention to provide a method of protecting effectively the steel joints of underground pipes.
It is another object of the present invention to provide a method of protecting the joints of underground pipes which method is simple to use.
It is still another object of the present invention to provide an inexpensive method of protecting the joints of underground pipes.
It is still another object of the present invention to provide a method of protecting steel joint rings which is virtually foolproof and which can be checked easily for proper application.
It is still another object of the present invention to provide a more rapid method of protecting underground steel pipe joints so as to minimize the length of time a trench must be kept open.
It is still another object of the present invention to provide a method of protecting underground steel pipe joints when the pipe trench contains water.
In accordance with the method of the present invention, a dry spigot band is placed over the spigot and onto the metal spigot ring. The spigot band is elastic, flexible and made preferably of a reticulated polyurethane foam which is impregnated with a cement such as Portland cement. After the spigot band has been placed properly on the spigot, the spigot is inserted in the usual manner into the bell of a previously laid length of pipe. The band is thus compressed within the joint recess in the space between the bell and spigot rings. Any water which enters the joint recess will hydrate the Portland cement, thereby forming a water impervious hard sealant in the joint which releases alkalinity with corrosion inhibiting properties.
Although protection of the steel joint rings from corrosive ground water entering the exterior joint recesses is a primary objective toward insuring maintenance-free service of a buried pipeline, aggressive fluids being transported through the pipeline may require the inner joint ring surfaces to be protected similarly by an alkaline environment. This is accomplished by inserting bell bands into the annular joint openings on the interior of the pipe to protect the inwardly exposed portions of the steel joint rings. Such a bell band may stay in place due to its own rigidity. Alternatively, this bell band may have an adhesive surface and may be secured to the interior face of the steel bell ring, concrete bell seat or concrete spigot end prior to joining the pipe. These techniques for placing the bell band omit necessity of workmen entering the interior of the pipe (after jointing) to mortar the inside of the joint.
FIG. 1 is a partial vertical sectional view of a rubber and steel pipe connection for a reinforced concrete pipe joint with metal bell and spigot rings spaced apart from each other.
FIG. 2 is the same as FIG. 1 with the spigot engaged into the bell.
FIG. 3 is a perspective view of a spigot band according to this invention and applied to a metal spigot ring.
FIG. 4 is a sectional view of a reticulated foam spigot band according to this invention.
FIG. 5 is a sectional view of the reticulated foam spigot band encased in a fabric sheath.
Referring to the drawing which illustrates a preferred embodiment of this invention, pipes 11 and 12 generally are made of reinforced concrete or prestressed concrete and are fitted respectively with a steel bell ring 13 and a steel spigot ring 14 at their respective ends. The spigot ring 14 has an annularly formed groove 16 into which is positioned a rubber gasket 17. When the spigot ring 14 with the rubber gasket 17 thereon is inserted into the bell ring 13, the rubber gasket 17 is compressed in the spigot ring groove 16 by an inside annular face 18 of the bell ring 13, thus effecting a watertight seal therebetween.
Because of the telescoping action of the steel bell ring 13 and the steel spigot ring 14 in compressing the rubber gasket 17 therebetween, portions of the bell and spigot rings 13, 14 are necessarily exposed and may be subject to corrosive influences. Protection of the steel rings 13, 14 is achieved by means of a bell band 19 and a spigot band 21 preferably of reticulated polyurethane foam which are impregnated with dry Portland cement. When the spigot ring 14 is inserted into the bell ring 13, bell band 19 and spigot band 21 are compressed between the pipes 11 and 12 as seen best in FIG. 2.
The spigot band 21 is stretched and pulled over the steel spigot ring 14 as shown in FIG. 1. The bell band 19 preferably is connected to the pipe 11 by means of a suitable adhesive. On insertion of the spigot ring 14 into the bell ring 13, the outer and inner portions of the joint have the spigot band 21 and bell band 19 positioned respectively to protect the steel bell and spigot rings 13, 14. When ground water contacts the band 21, the Portland cement (or other particulate alkaline material) impregnated therein is hydrated, thereby activating its alkalinity and corrosion inhibiting properties. Similarly, the fluid in the pipeline activates the corrosion inhibiting properties of the bell band 19. By this expedient, exposed portions of the steel bell and spigot rings 13, 14 are protected.
Several systems, which can take a reticulated or network form; such as felt, wool.[.,.]. polymer fibers or open celled polymers; may be used to make bands 19, 21. Usable polymers include vinyl, butadiene, styrene, urethane polymers, and the like. Foamed polyurethane is preferred. In one embodiment, the reticulated polyurethane foam used in the gasket is about 1 by 2 inches in cross section and has about 45 pores per square inch of surface. This polyurethane foam is seen in FIG. 4 and its cross-section carries about 5.5 ounces of Portland cement per linear foot. The foam can hold larger amounts of Portland cement, but such additional amounts of Portland cement do not increase effectiveness of the method of the present invention. The foam band may be surrounded by a water-soluble water-permeable member 22 as shown in FIG. 5 to reduce cement loss during shipping and placing, yet allowing water to pass through it for hydrating the Portland cement.
While cements other than Portland cement may be used, Portland cement is believed to be the most effective and economical of such cements.
The materials for the band are all commercially available. Reticulated polyurethane foam, for example, is manufactured by the Scott Paper Company's Foam Division in Chester, Pa. The Portland cement is conventional and is available widely. A non-woven polyester fabric for sheath 22 is obtainable from a wide variety of suppliers. All the separate materials are assembled by a fabricator skilled in the art of commercial textile production.
Each band preferably is packed individually in a waterproof plastic bag so as to avoid premature hydration of the Portland cement. A number of such bags are packaged into a cardboard container and the container is shipped to the field.
Field investigations of joints protected by the method of the present invention, in different types of soils for significant periods of time, have shown that this method protects effectively against corrosion. These investigations have demonstrated also that this method is readily and easily performed by relatively inexperienced personnel. Where bell and spigot bands of reticulted polyurethane foam impregnated with Portland cement are used in accordance with the present invention, no additional protection to the joint is required and most particularly application of grout to the outside of the joint and mortar to the inside of the joint are obviated.
It will be understood by those familiar with pipe design and installation that wide deviations may be made from the foregoing preferred embodiment without departing from the main theme of invention set forth in the following claims.
Claims (2)
- of claim 1 and a water-permeable sheath around the band..]. 5. The band
- of claim 7 with the cement being Portland cement. 6. The band of claim 7 with the sheath being a nonwoven polyester fabric. .Iadd.7. A distortable band, suitable for being fit into a joint between first and second continuous successive lengths of pipe made of concrete, wherein a bell formed on one end of the first length is engaged by a spigot formed on the end of a second length, the band made of a cellular water invadable material impregnated with a dry hydratable cement which is reactive with water to hydrate thereby depositing a water impervious hard substance in the joint, a water permeable sheath around the band..Iaddend.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/654,228 USRE29394E (en) | 1974-11-22 | 1976-02-02 | Corrosion protective band for underground pipe joints with metal parts |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US526320A US3904213A (en) | 1973-05-14 | 1974-11-22 | Corrosion protective band for underground pipe joints with metal parts |
US05/654,228 USRE29394E (en) | 1974-11-22 | 1976-02-02 | Corrosion protective band for underground pipe joints with metal parts |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US359967A Continuation-In-Part US3909010A (en) | 1973-05-14 | 1973-05-14 | Corrosion protective collar for underground pipe joints with metal parts |
US526320A Reissue US3904213A (en) | 1973-05-14 | 1974-11-22 | Corrosion protective band for underground pipe joints with metal parts |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE29394E true USRE29394E (en) | 1977-09-13 |
Family
ID=27062085
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/654,228 Expired - Lifetime USRE29394E (en) | 1974-11-22 | 1976-02-02 | Corrosion protective band for underground pipe joints with metal parts |
Country Status (1)
Country | Link |
---|---|
US (1) | USRE29394E (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4240470A (en) | 1978-02-21 | 1980-12-23 | Clow Corporation | Composite pipe having an integral bell end |
US6283810B1 (en) | 1998-11-18 | 2001-09-04 | Robert B. Evans | Non-mold method of forming objects and articles formed thereby |
US6503113B2 (en) | 1998-11-18 | 2003-01-07 | Robert B. Evans | Non-mold method of forming objects and articles formed thereby |
US20140117663A1 (en) * | 2012-10-26 | 2014-05-01 | Munro Ltd. | Pipe connection to form a liquid tight seal and method of forming the same |
US20190078706A1 (en) * | 2016-02-24 | 2019-03-14 | ACO Severin Ahlmann GmbH & Co. Kommanditgesellschaft | Device for guiding liquid and production method |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1662603A (en) * | 1926-10-22 | 1928-03-13 | William C Ferguson | Pipe-jointing element |
US2051557A (en) * | 1934-12-15 | 1936-08-18 | Firm Ag Hunziker & Cie | Pipe joint, particularly for concrete pipes |
US2140672A (en) * | 1937-04-17 | 1938-12-20 | Glenn L Martin Co | Method of producing a seal |
US2309658A (en) * | 1939-06-06 | 1943-02-02 | Water & Sewer Equipment Corp | Packing device |
US2662555A (en) * | 1948-12-03 | 1953-12-15 | Lock Joint Pipe Co | Pipe and method for making the same |
US3095619A (en) * | 1958-12-16 | 1963-07-02 | Edwin F Peterson | Method and means for sealing adjacent coacting closure surfaces of cavity contouringstructures |
US3243388A (en) * | 1961-07-24 | 1966-03-29 | Casius Corp Ltd | Plastic building material |
US3354099A (en) * | 1964-03-10 | 1967-11-21 | Frederick C Stegeman | Polyurethane-hydraulic cement compositions and process for manufacturing the same |
US3729205A (en) * | 1971-01-07 | 1973-04-24 | M Kwok | Gaskets |
US3771175A (en) * | 1971-09-23 | 1973-11-13 | A Goettl | Seal |
US3912285A (en) * | 1973-05-14 | 1975-10-14 | Interpace Corp | Corrosion protective collar for underground pipe joints with metal parts |
-
1976
- 1976-02-02 US US05/654,228 patent/USRE29394E/en not_active Expired - Lifetime
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1662603A (en) * | 1926-10-22 | 1928-03-13 | William C Ferguson | Pipe-jointing element |
US2051557A (en) * | 1934-12-15 | 1936-08-18 | Firm Ag Hunziker & Cie | Pipe joint, particularly for concrete pipes |
US2140672A (en) * | 1937-04-17 | 1938-12-20 | Glenn L Martin Co | Method of producing a seal |
US2309658A (en) * | 1939-06-06 | 1943-02-02 | Water & Sewer Equipment Corp | Packing device |
US2662555A (en) * | 1948-12-03 | 1953-12-15 | Lock Joint Pipe Co | Pipe and method for making the same |
US3095619A (en) * | 1958-12-16 | 1963-07-02 | Edwin F Peterson | Method and means for sealing adjacent coacting closure surfaces of cavity contouringstructures |
US3243388A (en) * | 1961-07-24 | 1966-03-29 | Casius Corp Ltd | Plastic building material |
US3354099A (en) * | 1964-03-10 | 1967-11-21 | Frederick C Stegeman | Polyurethane-hydraulic cement compositions and process for manufacturing the same |
US3729205A (en) * | 1971-01-07 | 1973-04-24 | M Kwok | Gaskets |
US3771175A (en) * | 1971-09-23 | 1973-11-13 | A Goettl | Seal |
US3912285A (en) * | 1973-05-14 | 1975-10-14 | Interpace Corp | Corrosion protective collar for underground pipe joints with metal parts |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4240470A (en) | 1978-02-21 | 1980-12-23 | Clow Corporation | Composite pipe having an integral bell end |
US6283810B1 (en) | 1998-11-18 | 2001-09-04 | Robert B. Evans | Non-mold method of forming objects and articles formed thereby |
US6503113B2 (en) | 1998-11-18 | 2003-01-07 | Robert B. Evans | Non-mold method of forming objects and articles formed thereby |
US20140117663A1 (en) * | 2012-10-26 | 2014-05-01 | Munro Ltd. | Pipe connection to form a liquid tight seal and method of forming the same |
US20190078706A1 (en) * | 2016-02-24 | 2019-03-14 | ACO Severin Ahlmann GmbH & Co. Kommanditgesellschaft | Device for guiding liquid and production method |
US10801648B2 (en) * | 2016-02-24 | 2020-10-13 | ACO Severin Ahlmann GmbH & Co. Kommanditgesellschaft | Device for guiding liquid and production method |
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