US3772772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coilable waveguide
Assignee: Hackethal Draht Kabel Werke AG
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Filing: 1971-08-05
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Granted: 1973-11-20
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Expires: 1991-08-05
Abstract
Abstract A coilable, corrugated waveguide having an elliptical cross section and a dielectric covering on the outer surface thereof; and a method of making the same.
Inventors
- 👤 G Lehnert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:38
CPC Classifications
B; B21; B21C; B21C47/00; B21C47/02; B21C47/04; H; H01; H01P; H01P3/00; H01P3/12; H01P3/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
The method of making a waveguide for electromagnetic waves comprising the successive immediate steps of forming an elongated strip of metal material into a continuously extending tubing of circular cross section with longitudinally abutting edges, continuously moving said tubing in a longitudinal path, continuously welding the longitudinally abutting edges of the moving tubing at a given point in said path, continuously helically corrugating said welded seam tubing in said path in a direction along and about the longitudinal axis of said tubing, continuously engaging said moving corrugated tubing in said path with opposed ellipital cross sectional rotatable deforming means to convert the circular cross section of said moving corrugated tubing to an elliptical cross section.
Claim 2
Independent Claim
115 words
The method of making a waveguide for electromagnetic waves comprising the successive immediate steps of forming an elongated strip of metal material into a continuously extending tubing of circular cross section with longitudinally abutting edges, continuously moving said tubing in a longitudinal path, continuously welding the longitudinally abutting edges of the moving tubing at a given point in said path, continuously helically corrugating said welded seam tubing in said path in a direction along and about the longitudinal axis of said tubing, continuously engaging said moving corrugated tubing in said path with opposed ellipital cross sectional rotatable deforming means to convert the circular cross section of said moving corrugated tubing to an elliptical cross section.
Claim 3
Dependent Claim
39 words
The method of claim 1 and further including the step of spraying a solidifying liquid plastic on the outer surface of the corrugated tubing of elliptical cross section to fill the corrugation troughs for providing a continuously smooth sheath.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |