US4432824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for internal pipe protection
Assignee: Raychem Corp
•
Filing: 1982-07-26
•
Granted: 1984-02-21
•
Expires: 2002-07-26
Abstract
Abstract The invention is a method and device for providing a protective coating for the inside of pipes, said method utilizing a device which is remotely actuated from outside said pipes. Specifically, the device comprises a memory metal delivery means, a corrosion resistant liner means, and a bonding means, said device expanding upon application of heat toward the inner wall of the pipe to cause the bonding means to flow progressively between the liner means and the inside of the pipe to thereby preclude air entrapment and to bond said liner means to the inside of the pipe.
Inventors
- 👤 Paul M. Cook
- 👤 Richard F. Otte
- 👤 James L. Claypool
- 👤 Lawrence J. White
- 👤 Harry C. Broyles
- 👤 Peter L. Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:29
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/20; F16L47/22; F16L58/00; F16L58/18; F16L58/181
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
A method of corrosion protecting the inside section of a pipe comprising the steps of: placing a heat-activated pipe protection device within the section of the pipe to be protected, said device having a radially expandable delivery means, said delivery means being generally frustro-conical in shape, which is cage-like with a plurality of slots therein, a heat-deformable corrosion-resistant liner means outside and in contact with said delivery means, and a heat-activatable bonding means outside and in contact with said liner means; heating the outside of said pipe generally uniformly along the section to be protected, thereby expanding said delivery means, deforming said liner means, and forcing said bonding means radially outwardly progressively into contact with the inside of the pipe, said bonding means flowing progressively between said liner means and the inside of the pipe to preclude air entrapment between said liner means and the inside of the pipe, and bonding said liner means to the inside of said pipe.
Claim 2
Independent Claim
160 words
A method of corrosion protecting the inside section of a pipe comprising the steps of: placing a heat-activated pipe protection device within the section of the pipe to be protected, said device having a radially expandable delivery means, said delivery means being generally frustro-conical in shape, which is cage-like with a plurality of slots therein, a heat-deformable corrosion-resistant liner means outside and in contact with said delivery means, and a heat-activatable bonding means outside and in contact with said liner means; heating the outside of said pipe generally uniformly along the section to be protected, thereby expanding said delivery means, deforming said liner means, and forcing said bonding means radially outwardly progressively into contact with the inside of the pipe, said bonding means flowing progressively between said liner means and the inside of the pipe to preclude air entrapment between said liner means and the inside of the pipe, and bonding said liner means to the inside of said pipe.
Claim 3
Independent Claim
153 words
A method of corrosion protecting the inside section of a pipe comprising the steps of: placing a heat activated pipe protection device within the section of the pipe to be protected, said device having a radially expandable delivery means, said delivery means being cage-like with a plurality of slots therein, a heat-deformable corrosion-resistant liner means outside and in contact with said delivery means, and a heat-activatable bonding means outside and in contact with said liner means; heating the outside of said pipe progressively along the section to be protected, thereby causing progressive radial expansion of said liner means, forcing said bonding means radially outwardly progressively into contact with the inside of the pipe, said bonding means flowing progressively between said liner means and the inside of the pipe to preclude air entrapment between said liner means and the inside of the pipe, and bonding said liner means to the inside of said pipe.
Claim 4
Independent Claim
153 words
A method of corrosion protecting the inside section of a pipe comprising the steps of: placing a heat activated pipe protection device within the section of the pipe to be protected, said device having a radially expandable delivery means, said delivery means being cage-like with a plurality of slots therein, a heat-deformable corrosion-resistant liner means outside and in contact with said delivery means, and a heat-activatable bonding means outside and in contact with said liner means; heating the outside of said pipe progressively along the section to be protected, thereby causing progressive radial expansion of said liner means, forcing said bonding means radially outwardly progressively into contact with the inside of the pipe, said bonding means flowing progressively between said liner means and the inside of the pipe to preclude air entrapment between said liner means and the inside of the pipe, and bonding said liner means to the inside of said pipe.
Claim 5
Independent Claim
181 words
A method of corrosion protecting the inside section of a pipe comprising the steps of: placing a heat activated pipe protection device within a pipe in a position remote from the section to be protected, said device having a radially expandable delivery means, said delivery means being generally frustro-conical in shape, which is cage-like with a plurality of slots therein, a heat-deformable corrosion-resistant liner means outside and in contact with said delivery means, and a heat-activatable bonding means outside and in contact with said liner means; moving said heat activated pipe protection device to the section of the pipe to be protected; and heating the outside of said pipe generally uniformly along the section to be protected, expanding said delivery means, thereby deforming said liner means, forcing said bonding means radially outwardly progressively into contact with the inside of the pipe, said bonding means flowing progressively between said liner means and the inside of the pipe to preclude air entrapment between said liner means and the inside of the pipe, and bonding said liner means to the inside of said pipe.
Claim 6
Independent Claim
181 words
A method of corrosion protecting the inside section of a pipe comprising the steps of: placing a heat activated pipe protection device within a pipe in a position remote from the section to be protected, said device having a radially expandable delivery means, said delivery means being generally frustro-conical in shape, which is cage-like with a plurality of slots therein, a heat-deformable corrosion-resistant liner means outside and in contact with said delivery means, and a heat-activatable bonding means outside and in contact with said liner means; moving said heat activated pipe protection device to the section of the pipe to be protected; and heating the outside of said pipe generally uniformly along the section to be protected, expanding said delivery means, thereby deforming said liner means, forcing said bonding means radially outwardly progressively into contact with the inside of the pipe, said bonding means flowing progressively between said liner means and the inside of the pipe to preclude air entrapment between said liner means and the inside of the pipe, and bonding said liner means to the inside of said pipe.
Claim 7
Independent Claim
174 words
A method of corrosion protecting the inside section of a pipe comprising the steps of: placing a heat activated pipe protection device within a pipe in a position remote from the section to be protected, said device having a radially expandable delivery means, said delivery means being cage-like with a plurality of slots therein, a heat-deformable corrosion-resistant liner means outside and in contact with said delivery means, and a heat-activatable bonding means outside and in contact with said liner means; moving said heat activated pipe protection device to the section of the pipe to be protected; and heating the outside of said pipe progressively along the section to be protected, thereby causing progressive radial expansion of said liner means, forcing said bonding means radially outwardly progressively into contact with the inside of the pipe, said bonding means flowing progressively between said liner means and the inside of the pipe to preclude air entrapment between said liner means and the inside of the pipe, and bonding said liner means to the inside of said pipe.
Claim 8
Independent Claim
174 words
A method of corrosion protecting the inside section of a pipe comprising the steps of: placing a heat activated pipe protection device within a pipe in a position remote from the section to be protected, said device having a radially expandable delivery means, said delivery means being cage-like with a plurality of slots therein, a heat-deformable corrosion-resistant liner means outside and in contact with said delivery means, and a heat-activatable bonding means outside and in contact with said liner means; moving said heat activated pipe protection device to the section of the pipe to be protected; and heating the outside of said pipe progressively along the section to be protected, thereby causing progressive radial expansion of said liner means, forcing said bonding means radially outwardly progressively into contact with the inside of the pipe, said bonding means flowing progressively between said liner means and the inside of the pipe to preclude air entrapment between said liner means and the inside of the pipe, and bonding said liner means to the inside of said pipe.
References Cited (Backward Citations)
US2415912A
Cited
US3135047A
Cited
US4206786A
Cited
US3415544A
Cited
US3508766A
Cited
US3770556A
Cited
US3758361A
Cited
US3817805A
Cited
US4042559A
Cited
US4207364A
Cited
US3799584A
Cited
US3890483A
Cited
US3965555A
Cited
AU7415374A
Cited
US3968552A
Cited
US3915478A
Cited
GB1554431A
Cited
US4026583A
Cited
US4245674A
Cited
US4197880A
Cited
US4295494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |