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US4261806A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for the treatment of inner surfaces of a tubular body of a plastic with low temperature plasma

Assignee: Shin-Etsu Chemical Co Ltd
•
Filing: 1980-01-15
•
Granted: 1981-04-14
•
Expires: 2000-01-15
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Abstract

Abstract The invention provides an effective method for subjecting the inner surface of a tubular body made of a plastic resin to a treatment with low temperature plasma according to which the tubular body is dipped in an insulating oil bath while the inside of the tubular body is filled with a plasma gas under a reduced pressure and electric power for the generation of a low temperature plasma is supplied to electrodes surrounding the tubular body in the insulating oil. Several of the problems in the prior art methods can be solved by the present invention such as undesirable thermal degradation of the tube surface by the evolved by the electric discharge, and power loss due to the generation of plasma outside the tubular body. When the method of the invention is applied to the treatment of a continuous length tubular body, the tubular body is continuously moved in the insulating oil through the electrodes surrounding it, with the optional provision of a sleeve made of an insulating material placed between the electrodes and the tubular body, so as that the tubular body is free from adverse effects caused by direct contact with the electrodes.

Inventors

  • 👤 Michihiko Asai
  • 👤 Yoshio Suda
  • 👤 Kiyoshi Imada
  • 👤 Susumu Ueno
  • 👤 Hirokazu Nomura

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 20:06
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/22; A; A61; A61L; A61L33/00; A61L33/0094; B05D1/00; B05D1/62; B05D3/00; B05D3/14; B05D3/141; B05D7/222; B29; B29C; B29C59/00; B29C59/14; B29C59/142; B05D2201/00; B29K; B29K2023/00; B29K2027/00; B29K2027/06; B29L; B29L2023/00; B29L2023/22

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 108 words
A method for treating the inner surface of a tubular body made of a plastic resin comprising the steps of filling the interior of the tubular body with a gas at a reduced pressure sufficient to generate a low temperature plasma to treat the inner surface of the tubular body when the gas is subjected to electromagnetic energy, arranging a bath of insulating oil and dipping the tubular body in the bath of insulating oil, surrounding the tubular body in the oil bath with at least one electrode, and supplying electromagnetic energy to the electrode to generate the low temperature plasma in the gas inside the tubular body.
Claim 2
Independent Claim 108 words
A method for treating the inner surface of a tubular body made of a plastic resin comprising the steps of filling the interior of the tubular body with a gas at a reduced pressure sufficient to generate a low temperature plasma to treat the inner surface of the tubular body when the gas is subjected to electromagnetic energy, arranging a bath of insulating oil and dipping the tubular body in the bath of insulating oil, surrounding the tubular body in the oil bath with at least one electrode, and supplying electromagnetic energy to the electrode to generate the low temperature plasma in the gas inside the tubular body.
Claim 3
Independent Claim 116 words
A method for treating the inner surface of a tubular body made of a plastic resin comprising the steps of filling the interior of the tubular body with a gas at a reduced pressure sufficient to generate a low temperature plasma to treat the inner surface of the tubular body when the gas is subjected to electromagnetic energy, arranging a bath of insulating oil and dipping the tubular body in the insulating oil, surrounding the tubular body in the oil bath with a sleeve made of insulating material, surrounding the sleeve with at least one electrode, and supplying electromagnetic energy to the electrode to generate the low temperature plasma in the gas inside the tubular body.
Claim 4
Independent Claim 116 words
A method for treating the inner surface of a tubular body made of a plastic resin comprising the steps of filling the interior of the tubular body with a gas at a reduced pressure sufficient to generate a low temperature plasma to treat the inner surface of the tubular body when the gas is subjected to electromagnetic energy, arranging a bath of insulating oil and dipping the tubular body in the insulating oil, surrounding the tubular body in the oil bath with a sleeve made of insulating material, surrounding the sleeve with at least one electrode, and supplying electromagnetic energy to the electrode to generate the low temperature plasma in the gas inside the tubular body.
Claim 5
Independent Claim 23 words
The method as claimed in claims 1 or 2, including dipping the tubular body in a bath of insulating oil comprising silicone fluid.
Claim 6
Dependent Claim 32 words
The method as claimed in claim 1 or 2, including filling the interior of the tubular body with a gas at a pressure in the range of from 0.001 to 10 Torr.
Claim 7
Dependent Claim 22 words
The method as claimed in claim 1 or 2, including continuously moving the tubular body through the electrode in the oil bath.

References Cited (Backward Citations)

US3280018A Cited
US3497438A Cited
US3399252A Cited
US3547802A Cited
CA925470A Cited
US3762941A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-04-13 1984-10-13 1985-04-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-04-13 1988-10-13 1989-04-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-04-13 1992-10-13 1993-04-14 $7700.00 Window Closed / Lapsed

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