US3810302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a wave-guide
Assignee: US Philips Corp
•
Filing: 1972-12-06
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Granted: 1974-05-14
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Expires: 1992-12-06
Abstract
Abstract A method of manufacturing a flat waveguide in which a hollow core of a soft metal is introduced into a steel tube, this assembly is then provided with two parallel flat faces by flattening the tube with the core on two sides, after which the core is removed by etching. By using a hollow core, elongation, contraction and tearing of the wall of the tube is prevented. The flat tube obtained by the method according to the invention has a smooth and regular inner surface and a uniform wall thickness.
Inventors
- 👤 G Broers
- 👤 Esdonk J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:22
CPC Classifications
H; H01; H01P; H01P11/00; H01P11/001; H01P11/002; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
49 words
A method of manufacturing a wave-guide comprising the steps of introducing a cylindrical tubular core of a corrodible metal into a straight, cylindrical tube of a chemically resistant metal, flattening at least a portion of the resulting assembly on two opposite sides thereof and removing the core by etching.
Claim 2
Independent Claim
49 words
A method of manufacturing a wave-guide comprising the steps of introducing a cylindrical tubular core of a corrodible metal into a straight, cylindrical tube of a chemically resistant metal, flattening at least a portion of the resulting assembly on two opposite sides thereof and removing the core by etching.
Claim 3
Dependent Claim
64 words
A method as claimed in claim 1 of manufacturing a bent waveguide in which the flat faces are located on the bent portion parallel to the plane through the center line of the guide, characterized in that after introducing the core into the tube and prior to the flattening of the assembly, the tube with the core is bent through a previously determined angle.
Claim 4
Dependent Claim
52 words
A method as claimed in claim 1, characterized in that a duct for the circulation of etching liquid is formed by using a tubular core the end surface of which, viewed in cross-section, is smaller than the cross-sectional area of the passage of the flattened portion of the wave-guide to be obtained.
Claim 5
Dependent Claim
33 words
A method as claimed in claim 1, wherein the cross-sectional, annular surface of said core is at most equal to the cross-sectional area of the open passage in the part to be flattened.
Claim 6
Dependent Claim
14 words
A method as claimed in claim 1, wherein said chemically resistant metal is steel.
References Cited (Backward Citations)
US1396918A
Cited
US1693487A
Cited
US1763651A
Cited
US1980716A
Cited
US2373405A
Cited
US3374532A
Cited
US3403543A
Cited
US3585540A
Cited
US3641665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |