US4386629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for internal pipe protection
Assignee: Raychem Corp
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Filing: 1981-07-07
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Granted: 1983-06-07
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Expires: 2001-07-07
Abstract
Abstract A device for providing a protective coating for the inside of pipes, said device being remotely actuated from outside said pipes. Specifically, the device comprises a high modulus engineering plastic 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 18:57
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/18; F16L58/181; F16L47/00; F16L47/20; F16L47/22; Y; Y10; Y10S; Y10S138/00; Y10S138/06; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/1393
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
205 words
A device for protecting the inside of a pipe, the pipe comprising a cylindrical member, said device comprising: a radially compressed, tubular delivery means of high modulus engineering plastic, said delivery means being generally frustro-conical in shape and having a radially continuous sidewall which is cage-like with a plurality of slots therein, said delivery means being flexible in both radial and axial directions; tubular liner means outside of and in contact with said delivery means to radially constrain said delivery means, said liner means being generally frustro-conical in shape, corrosion resistant and being softenable and deformable substantially only radially upon application of heat; and bonding means outside of and in contact with said liner means to bond said liner means to the inside surface of a cylindrical pipe, said bonding means being flowable and activated by application of heat, said delivery means expanding radially when said liner means has been softened through the application of heat uniformly along the length of the device, the radial expansion of the frustro-conical shape delivery and liner means causing said bonding means to flow progressively axially along the outer surface of said liner means to preclude air entrapment between said liner means and the inside of a cylindrical pipe.
Claim 2
Independent Claim
205 words
A device for protecting the inside of a pipe, the pipe comprising a cylindrical member, said device comprising: a radially compressed, tubular delivery means of high modulus engineering plastic, said delivery means being generally frustro-conical in shape and having a radially continuous sidewall which is cage-like with a plurality of slots therein, said delivery means being flexible in both radial and axial directions; tubular liner means outside of and in contact with said delivery means to radially constrain said delivery means, said liner means being generally frustro-conical in shape, corrosion resistant and being softenable and deformable substantially only radially upon application of heat; and bonding means outside of and in contact with said liner means to bond said liner means to the inside surface of a cylindrical pipe, said bonding means being flowable and activated by application of heat, said delivery means expanding radially when said liner means has been softened through the application of heat uniformly along the length of the device, the radial expansion of the frustro-conical shape delivery and liner means causing said bonding means to flow progressively axially along the outer surface of said liner means to preclude air entrapment between said liner means and the inside of a cylindrical pipe.
Claim 3
Independent Claim
200 words
A device for protecting the inside of a pipe, the pipe comprising a cylindrical member, said device comprising: a radially compressed, tubular delivery means of high modulus engineering plastic, said delivery means being generally barrel-shaped and having a radially continuous sidewall which is cage-like with a plurality of slots therein, said delivery means being flexible in both radial and axial directions; tubular liner means outside of and in contact with said delivery means to radially constrain said delivery means, said liner means being generally barrel-shaped, corrosion resistant and being softenable and deformable substantially only radially upon application of heat; and bonding means outside of and in contact with said liner means to bond said liner means to the inside surface of a cylindrical pipe, said bonding means being flowable and activated by application of heat, said delivery means expanding radially when said liner means has been softened through the application of heat uniformly along the length of the device, the radial expansion of the barrel-shaped delivery and liner means causing said bonding means to flow progressively axially along the outer surface of said liner means to preclude air entrapment between said liner means and the inside of a cylindrical pipe.
Claim 4
Independent Claim
200 words
A device for protecting the inside of a pipe, the pipe comprising a cylindrical member, said device comprising: a radially compressed, tubular delivery means of high modulus engineering plastic, said delivery means being generally barrel-shaped and having a radially continuous sidewall which is cage-like with a plurality of slots therein, said delivery means being flexible in both radial and axial directions; tubular liner means outside of and in contact with said delivery means to radially constrain said delivery means, said liner means being generally barrel-shaped, corrosion resistant and being softenable and deformable substantially only radially upon application of heat; and bonding means outside of and in contact with said liner means to bond said liner means to the inside surface of a cylindrical pipe, said bonding means being flowable and activated by application of heat, said delivery means expanding radially when said liner means has been softened through the application of heat uniformly along the length of the device, the radial expansion of the barrel-shaped delivery and liner means causing said bonding means to flow progressively axially along the outer surface of said liner means to preclude air entrapment between said liner means and the inside of a cylindrical pipe.
Claim 5
Independent Claim
200 words
A device for protecting the inside of a pipe, the pipe comprising a cylindrical member, said device comprising: a radially compressed, tubular delivery means of high modulus engineering plastic, said delivery means being generally bell-shaped and having a radially continuous sidewall which is cage-like with a plurality of slots therein, said delivery means being flexible in both radial and axial directions; tubular liner means outside of and in contact with said delivery means to radially constrain said delivery means, said liner means being generally bell-shaped, corrosion resistant and being softenable and deformable substantially only radially upon application of heat; and bonding means outside of and in contact with said liner means to bond said liner means to the inside surface of a cylindrical pipe, said bonding means being flowable and activated by application of heat, said delivery means expanding radially when said liner means has been softened through the application of heat uniformly along the length of the device, the radial expansion of the bell-shaped delivery and liner means causing said bonding means to flow progressively axially along the outer surface of said liner means to preclude air entrapment between said liner means and the inside of a cylindrical pipe.
Claim 6
Independent Claim
200 words
A device for protecting the inside of a pipe, the pipe comprising a cylindrical member, said device comprising: a radially compressed, tubular delivery means of high modulus engineering plastic, said delivery means being generally bell-shaped and having a radially continuous sidewall which is cage-like with a plurality of slots therein, said delivery means being flexible in both radial and axial directions; tubular liner means outside of and in contact with said delivery means to radially constrain said delivery means, said liner means being generally bell-shaped, corrosion resistant and being softenable and deformable substantially only radially upon application of heat; and bonding means outside of and in contact with said liner means to bond said liner means to the inside surface of a cylindrical pipe, said bonding means being flowable and activated by application of heat, said delivery means expanding radially when said liner means has been softened through the application of heat uniformly along the length of the device, the radial expansion of the bell-shaped delivery and liner means causing said bonding means to flow progressively axially along the outer surface of said liner means to preclude air entrapment between said liner means and the inside of a cylindrical pipe.
Claim 7
Independent Claim
212 words
A device for protecting the inside of a pipe, the pipe comprising a cylindrical member, said device comprising: a radially compressed, tubular delivery means of high modulus engineering plastic, said delivery means having a radially continuous sidewall which is cage-like with a plurality of slots therein, said delivery means being flexible in both radial and axial directions, said delivery means having axially progressive radial expansion means; tubular liner means outside of and in contact with said delivery means to radially constrain said delivery means, said liner means being corrosion resistant and being softenable and deformable substantially only radially upon application of heat; and bonding means outside of and in contact with said liner means to bond said liner means to the inside surface of a cylindrical pipe, said bonding means being flowable and activated by application of heat, said delivery means expanding radially when said liner means has been softened through the application of heat along the length of the device, the radial expansion of the delivery means and liner means causing the bonding means to progressively contact the inside of a cylindrical pipe and to flow progressively axially along the outer surface of said liner means to preclude air entrapment between said liner means and the inside of a cylindrical pipe.
Claim 8
Independent Claim
212 words
A device for protecting the inside of a pipe, the pipe comprising a cylindrical member, said device comprising: a radially compressed, tubular delivery means of high modulus engineering plastic, said delivery means having a radially continuous sidewall which is cage-like with a plurality of slots therein, said delivery means being flexible in both radial and axial directions, said delivery means having axially progressive radial expansion means; tubular liner means outside of and in contact with said delivery means to radially constrain said delivery means, said liner means being corrosion resistant and being softenable and deformable substantially only radially upon application of heat; and bonding means outside of and in contact with said liner means to bond said liner means to the inside surface of a cylindrical pipe, said bonding means being flowable and activated by application of heat, said delivery means expanding radially when said liner means has been softened through the application of heat along the length of the device, the radial expansion of the delivery means and liner means causing the bonding means to progressively contact the inside of a cylindrical pipe and to flow progressively axially along the outer surface of said liner means to preclude air entrapment between said liner means and the inside of a cylindrical pipe.
Claim 9
Independent Claim
34 words
A device as in claims 1, 2, 3, or 4 wherein the liner means comprises a crosslinked polymeric material, said liner means radially constraining said delivery means before heat is applied to said device.
Claim 10
Dependent Claim
47 words
A device as in claim 5 wherein said bonding means and said liner means comprise an integral layer of polymeric material, said liner means defining an inside region of said layer which is substantially crosslinked an said bonding means defining an outside region which is substantially non-crosslinked.
Claim 11
Independent Claim
38 words
A device as in claims 1, 2, 3, or 4 further comprising a positioning means contacting said device to move said device from a remote position to an activating position where said device is heated and thus expanded.
Claim 12
Independent Claim
20 words
A device as in claims 1, 2, 3, or 4 wherein said delivery means is bonded to said liner means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |