Patent US4213486A successfully refreshed from Google Patents.
US4213486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated pipe and process for making same
Assignee: Kendall Co
•
Filing: 1978-11-06
•
Granted: 1980-07-22
•
Expires: 1998-11-06
Abstract
Abstract Steel pipe is provided with an external protective coating by first applying a corrosion protective coating of fused powdered epoxy resin adhered to the pipe, then applying (e.g. as by wrapping a sheet) an outer polyolefin layer directly onto the corrosion protective coating. The outer sheet of polyolefin is provided with a pressure-sensitive adhesive or a hot melt adhesive which adhesive may also be reactive with the epoxy coating (e.g. one having free carboxyl group such as ethylene acrylic acid copolymer). The polyolefin is preferably polyethylene or polypropylene and most preferably polyethylene. Either high or low density polyolefin may be used.
Inventors
- 👤 Carlos M. Samour
- 👤 Earl G. Jackson
- 👤 Samuel J. Thomas
- 👤 Louie E. Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:04
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B29; B29C; B29C63/00; B29C63/02; B29C63/04; B29C63/08; B29C63/10; F; F16; F16L; F16L58/00; F16L58/02; F16L58/16; Y; Y10; Y10S; Y10S138/00; Y10S138/06; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1359
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
63 words
A coated article comprising a metallic pipe having a protection layer thereon, said layer comprising a first layer bonded to the pipe of an epoxy coating derived from a bis-phenol A polymer of 2 to 10 mils and an adhesive faced thermoplastic polymer tape wrapping adhesively bonded to said epoxy coating, said protection layer being from 6 to about 50 mils in thickness.
Claim 2
Dependent Claim
63 words
A coated article comprising a metallic pipe having a protection layer thereon, said layer comprising a first layer bonded to the pipe of an epoxy coating derived from a bis-phenol A polymer of 2 to 10 mils and an adhesive faced thermoplastic polymer tape wrapping adhesively bonded to said epoxy coating, said protection layer being from 6 to about 50 mils in thickness.
Claim 3
Dependent Claim
13 words
An article as set forth in claim 1 wherein the pipe is steel.
Claim 4
Dependent Claim
14 words
An article as set forth in claim 2 wherein the tape polymer is polyethylene.
Claim 5
Dependent Claim
21 words
An article as set forth in claim 3 wherein the thickness of the protection layer is from 12 to 50 mils.
Claim 6
Dependent Claim
15 words
An article as set forth in claim 4 wherein the adhesive is a pressure-sensitive adhesive.
Claim 7
Dependent Claim
15 words
An article as set forth in claim 4 wherein the adhesive is a heat-activated polymer.
Claim 8
Dependent Claim
19 words
An article as set forth in claim 6 wherein the heat-activated polymer is chemically bonded to said epoxy coating.
Claim 9
Dependent Claim
17 words
An article as set forth in claim 7 wherein the heat-activated polymer is an ethylene-acrylic acid interpolymer.
Claim 10
Dependent Claim
46 words
An article as set forth in claim 1 wherein the epoxy coating is derived from a bis-phenol A polymer having terminal epoxy groups, a gel period of about 5 to about 35 seconds at 250° C. and a cure period of about 1 to 4 minutes.
Claim 11
Dependent Claim
15 words
An article as set forth in claim 5 wherein the adhesive is a butyl adhesive.
Claim 12
Dependent Claim
71 words
A process for externally protecting metal pipe which comprises providing heated pipe, electrostatically applying fusible Epoxy resin powder derived from a bis-phenol A polymer to the exterior surface of the metal to form a continuous coating of from 2 to 10 mils in thickness and thereafter spirally wrapping an adhesive-faced flexible thermoplastic polymer substrate so that the thickness of the epoxy coating and tape wrapping is from 6 to 50 mils.
Claim 13
Dependent Claim
71 words
A process for externally protecting metal pipe which comprises providing heated pipe, electrostatically applying fusible Epoxy resin powder derived from a bis-phenol A polymer to the exterior surface of the metal to form a continuous coating of from 2 to 10 mils in thickness and thereafter spirally wrapping an adhesive-faced flexible thermoplastic polymer substrate so that the thickness of the epoxy coating and tape wrapping is from 6 to 50 mils.
Claim 14
Dependent Claim
37 words
A process as set forth in claim 11 wherein the Epoxy powder has a gel time of from about 5 to about 35 seconds and a cure time of about 1 to 4 minutes at 250° C.
Claim 15
Dependent Claim
26 words
A process as defined in claim 12 wherein the temperature of the pipe is at least 25° F. above the fusion temperature of the epoxy resin.
Claim 16
Dependent Claim
21 words
A process as defined in claim 13 wherein the flexible substrate is polyethylene and the adhesive facing is a butyl-based adhesive.
Claim 17
Dependent Claim
18 words
A process as defined in claim 14 wherein the total coating thickness is from 12 to 50 mils.
Claim 18
Dependent Claim
25 words
A process as defined in claim 13, wherein the flexible substrate is polyethylene and the adhesive facing is a heat-activatable ethylene-acrylic acid hot melt adhesive.
References Cited (Backward Citations)
US3508946A
Cited
US3390704A
Cited
US3578615A
Cited
US3687765A
Cited
US3874418A
Cited
US3904346A
Cited
US4011354A
Cited
US4060655A
Cited
US4062710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |