Pipe coupling

Patent 4521037 Issued on June 4, 1985. Estimated Expiration Date:

August 20, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3826521

Pipe coupling
Patent #: 3971574
Issued on: 07/27/1976
Inventor: Curtin

Bell end of a bell and spigot joint
Patent #: 4258935
Issued on: 03/31/1981
Inventor: Rodrigo , et al.

Wet-dry cementable coupling for plastic pipe Patent #: 4281856
Issued on: 08/04/1981
Inventor: Litman , et al.

Inventor

Knox, Granville S.

Application

No. 06/642261 filed on 08/20/1984

US Classes:

285/15, REPAIR285/31, Inserted section285/423, Nonmetallic285/915MASTIC

Examiners

Primary: Arola, Dave W.

Attorney, Agent or Firm

Haefliger; William W.

International Classes

F16L 25/00 (20060101)
F16L 25/12 (20060101)
F16L 47/02 (20060101)

Abstract

A coupling for joining two pipe sections having elongated outer surfaces and end terminals, comprises:(a) a tubular extension fitted endwise between the pipe terminals to form joints therewith,(b) first and second collars telescopically movable axially of the tubular extension into coupling positions spanning the respective joints,(c) one collar having an axially elongated bore and counterbore, one of which has elongated slideable engagement with the outer surface of one end of the extension, and the other of which has elongated slideable engagement with the elongated outer surface of one pipe section,(d) the other collar having an axially elongated bore and counterbore, one of which has elongated slideable engagement with the outer surface of the other end of the extension, and the other of which has elongated slideable engagement with the elongated outer surface of the other pipe section,(e) and liquid bonding agent between the collar and said pipe sections and said extension to bond the collars to the extension and to the pipe sections, for sealing off therebetween.