US3796885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating a moving surface with a spark discharge
Assignee: Phillips Petroleum Co
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Filing: 1972-02-10
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Granted: 1974-03-12
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Expires: 1992-02-10
Abstract
Abstract The surface of an elongated article, particularly one of substantially circular cross section such as a rod or tube, is treated with a spark discharge by employing an apparatus comprising a stationary encircling electrode and a revolving electrode. The elongated article advances through the encircling electrode while the revolving electrode is caused to revolve about it at a rate sufficiently fast to insure the entire surface of the tube or rod is treated with the spark that discharges between the two electrodes.
Inventors
- 👤 D Shofner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:22
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/10; B29C59/106; B26; B26F; B26F1/00; B26F1/26; B26F1/28; B29C59/103; B29L; B29L2023/00; B29L2023/22; B29L2031/00; B29L2031/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
An apparatus for treating the surface of an elongated article with a spark discharge comprising in combination: 1. a first electrode, said first electrode being in the shape of a ring and having an inside diameter greater than the outside diameter of the elongated article; 2. a second electrode, which is a point electrode spaced apart from the first electrode and disposed so as to be capable of revolving about the elongated article; 3. means for driving the revolving electrode at variable speed; 4. means for advancing the elongated article at a substantially constant speed through the ring electrode along a line such that the center of the elongated article is substantially coincident with the center of the ring electrode; and 5. means for creating a potential difference between the two electrodes sufficient to create a spark discharge.
Claim 2
Independent Claim
138 words
An apparatus for treating the surface of an elongated article with a spark discharge comprising in combination: 1. a first electrode, said first electrode being in the shape of a ring and having an inside diameter greater than the outside diameter of the elongated article; 2. a second electrode, which is a point electrode spaced apart from the first electrode and disposed so as to be capable of revolving about the elongated article; 3. means for driving the revolving electrode at variable speed; 4. means for advancing the elongated article at a substantially constant speed through the ring electrode along a line such that the center of the elongated article is substantially coincident with the center of the ring electrode; and 5. means for creating a potential difference between the two electrodes sufficient to create a spark discharge.
Claim 3
Dependent Claim
27 words
a second electrode, which is a point electrode spaced apart from the first electrode and disposed so as to be capable of revolving about the elongated article;
Claim 4
Dependent Claim
27 words
a second electrode, which is a point electrode spaced apart from the first electrode and disposed so as to be capable of revolving about the elongated article;
Claim 5
Dependent Claim
24 words
An apparatus according to claim 1 wherein the variable speed means for driving the revolving electrode is a wheel having a variable speed drive.
Claim 6
Dependent Claim
19 words
An apparatus according to claim 1 wherein the gap between the ring electrode and the revolving electrode is adjustable.
Claim 7
Dependent Claim
9 words
means for driving the revolving electrode at variable speed;
Claim 8
Dependent Claim
9 words
means for driving the revolving electrode at variable speed;
Claim 9
Dependent Claim
37 words
means for advancing the elongated article at a substantially constant speed through the ring electrode along a line such that the center of the elongated article is substantially coincident with the center of the ring electrode; and
Claim 10
Dependent Claim
37 words
means for advancing the elongated article at a substantially constant speed through the ring electrode along a line such that the center of the elongated article is substantially coincident with the center of the ring electrode; and
Claim 11
Dependent Claim
14 words
An apparatus according to claim 1 wherein the revolving electrode is a discharge electrode.
Claim 12
Dependent Claim
16 words
means for creating a potential difference between the two electrodes sufficient to create a spark discharge.
Claim 13
Dependent Claim
16 words
means for creating a potential difference between the two electrodes sufficient to create a spark discharge.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |