Slip-joint coupling

Patent 4858958 Issued on August 22, 1989. Estimated Expiration Date:

March 14, 2008. 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

980245

2785910

3598430

3826521

Pipe coupling
Patent #: 4035002
Issued on: 07/12/1977
Inventor: Curtin

Pipe couplings
Patent #: 4072328
Issued on: 02/07/1978
Inventor: Elliott

Pipe coupling Patent #: 4690434
Issued on: 09/01/1987
Inventor: Schmidt

Inventor

Harbeke, Gerold J.

Application

No. 07/168020 filed on 03/14/1988

US Classes:

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

Examiners

Primary: Arola, Dave W.

Attorney, Agent or Firm

Griffin, Branigan & Butler

International Classes

F16L 25/12 (20060101)
F16L 13/10 (20060101)
F16L 13/00 (20060101)
F16L 25/00 (20060101)

Abstract

A slip-joint coupling (10) comprises a first coupling piece (12) having a first pipe-mounting portion (16) at one end and a first coupling mating portion (18) at the other end and a second coupling piece (14) having a second pipe-mounting portion (20) at one end and a second coupling mating portion (22) at the other end. The first and second pipe-mounting portions each has a coupling inner diameter as an inner diameter for snugly fitting on outer surfaces of standard plumbing pipes and a coupling outer diameter as an outer diameter. One of the first and second coupling mating portions has the coupling inner diameter as an inner diameter and has an intermediate diameter as an outer diameter. The intermediate diameter is intermediate the coupling inner and outer diameters. The other of said first and second coupling mating portions has the intermediate diameter as an inner diameter and the coupling diameter as an outer diameter. One of these coupling pieces has an internal shoulder between the pipe-mounting portion and the coupling mating portion. The mating portions are of equal length.