US3974306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating the inner surface of metal pipes
Assignee: Kansai Paint Co Ltd
•
Filing: 1973-10-04
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Granted: 1976-08-10
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Expires: 1993-10-04
Abstract
Abstract A method for coating the inner surface of a metal pipe having an inner diameter of about 1 to 15 cm, which comprises feeding from one end of said metal pipe dry particles of a coating composition into the interior of the metal pipe preheated at a temperature of from a softening point of said coating composition to below a melting point thereof, sucking air at the same time from the other end of the metal pipe so as to form an air stream carrying the particles and flowing in the interior of the pipe at a flow rate of about 4 to 20 m/sec and to allow the particles to deposit on the inner surface of the pipe, and fusing the deposited particles at a reduced pressure of 10 to about 100 mm Hg to form a continuous film on the inner surface of the pipe.
Inventors
- 👤 Keizo Inamura
- 👤 Tadayoshi Tatsuno
- 👤 Toshio Okoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:52
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/22; B05D7/222; B05D1/00; B05D1/002; B05D2401/00; B05D2401/30; B05D2401/32; B05D3/00; B05D3/02; B05D3/0218; B05D3/0254; B05D3/04; B05D3/0493; Y; Y10; Y10S; Y10S118/00; Y10S118/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A method for coating the inner surface of a metal pipe having an inner diameter of about 1 to 15 cm, which consists essentially of feeding from one end of said metal pipe dry particles of a coating composition into the interior of the metal pipe preheated at a temperature of from a softening point of said coating composition to below a melting point thereof, sucking air at the same time from the other end of the metal pipe so as to form an air stream carrying the particles and flowing in the interior of the pipe at a flow rate of about 4 to 20 m/sec and to allow the particles to deposit on the inner surface of the pipe, and fusing the deposited particles at a reduced pressure of 30 to about 100 mm Hg to form a continuous film on the inner surface of the pipe.
Claim 2
Independent Claim
149 words
A method for coating the inner surface of a metal pipe having an inner diameter of about 1 to 15 cm, which consists essentially of feeding from one end of said metal pipe dry particles of a coating composition into the interior of the metal pipe preheated at a temperature of from a softening point of said coating composition to below a melting point thereof, sucking air at the same time from the other end of the metal pipe so as to form an air stream carrying the particles and flowing in the interior of the pipe at a flow rate of about 4 to 20 m/sec and to allow the particles to deposit on the inner surface of the pipe, and fusing the deposited particles at a reduced pressure of 30 to about 100 mm Hg to form a continuous film on the inner surface of the pipe.
Claim 3
Dependent Claim
32 words
The method for coating the inner surface of a metal pipe according to claim 1, in which said flow rate of air stream is in the range of 3 to 13 m/sec.
Claim 4
Dependent Claim
30 words
The method for coating the inner surface of a metal pipe according to claim 1, in which said metal pipe is rotated at the rate of at least one r.p.m.
Claim 5
Dependent Claim
29 words
The method for coating the inner surface of a metal pipe according to claim 3, in which said pipe is rotated at the rate of 5 to 50 r.p.m.
Claim 6
Dependent Claim
30 words
The method for coating the inner surface of a metal pipe according to claim 1 in which the dry particles are fed into the pipe by a flock spray gun.
Claim 7
Dependent Claim
17 words
A method according to claim 1 wherein the reduced pressure is from 30 to 80 mm Hg.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |