US3947348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making of a wave guide
Assignee: KM Kabelmetal AG
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Filing: 1974-06-26
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Granted: 1976-03-30
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Expires: 1994-06-26
Abstract
Abstract A method of making a wave guide by electrolytically depositing copper on a mandrel is improved by using, e.g., a nickel steel mandrel having a thermal coefficient of expansion about one-tenth or less of that of copper. After plating, the assembly is heated so that the copper tube separates from the mandrel without sticking, and can be taken off without exercise of undue force, which could damage mandrel or tube.
Inventors
- 👤 Paul Schabernack
- 👤 Wolfgang VON Jan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:12
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/12; H01P3/13; H01P11/00; H01P11/001; H01P11/002
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
In a method for making a wave guide of cylindrical inner surface of accurate cross-section by means of electrolytically depositing material on a mandrel for forming a tube thereon to be removed from the mandrel, the improvement comprising: using a mandrel made of steel having 33 to 38% nickel for having a coefficient of thermal expansion sufficiently smaller than the coefficient of thermal expansion of the material as deposited on the mandrel; disposing the mandrel in a vertical disposition during the depositing; and heating the tube as made subsequently to the electrolytic depositing until the mandrel separates completely from the tube permitting removal of the mandrel from the interior of the tube.
Claim 2
Dependent Claim
112 words
In a method for making a wave guide of cylindrical inner surface of accurate cross-section by means of electrolytically depositing material on a mandrel for forming a tube thereon to be removed from the mandrel, the improvement comprising: using a mandrel made of steel having 33 to 38% nickel for having a coefficient of thermal expansion sufficiently smaller than the coefficient of thermal expansion of the material as deposited on the mandrel; disposing the mandrel in a vertical disposition during the depositing; and heating the tube as made subsequently to the electrolytic depositing until the mandrel separates completely from the tube permitting removal of the mandrel from the interior of the tube.
Claim 3
Dependent Claim
23 words
In a method as in claim 1, wherein the coefficients of thermal expansion are apart by at least about one-half order of magnitude.
Claim 4
Dependent Claim
20 words
In a method as in claim 1, wherein the tube is heated to a temperature in excess of about 100°C.
Claim 5
Dependent Claim
20 words
In a method as in claim 1, wherein a thin chromium or nickel layer has been provided on the mandrel.
Claim 6
Dependent Claim
15 words
In a method as in claim 1, wherein copper is electrolytically deposited on the mandrel.
Claim 7
Dependent Claim
30 words
In a method as in claim 5, wherein a material of higher mechanical strength than copper is subsequently deposited on the copper as previously deposited, but prior to said heating.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |