Patent US4818962A successfully refreshed from Google Patents.
US4818962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide obtained by selective etching method
Assignee: Thales SA
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Filing: 1986-08-26
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Granted: 1989-04-04
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Expires: 2006-08-26
Abstract
Abstract The invention provides mainly a selective etching method for the total or partial chemical ablation at certain positions of a metal sheet, and a waveguide obtained by said method. Complete ablation is obtained by etching both faces of the metal sheet. Partial ablation is obtained by etching only one of the faces of the metal sheet. Partial ablation allows grooves and semi-thicknesses to be obtained for forming bends and rabbets for the formation of three dimensional pieces.
Inventors
- 👤 Andre Molaine
- 👤 Jean Poitevin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:10
CPC Classifications
H; H01; H01P; H01P11/00; C; C23; C23F; C23F1/00; C23F1/02; C23F1/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
A waveguide formed from a metal sheet, said waveguide including stress-free cutouts and ablations formed by chemical etching and having at least one bent portion, bent along a region of reduced thickness, said region of reduced thickness formed by chemical ablation.
Claim 2
Dependent Claim
41 words
A waveguide formed from a metal sheet, said waveguide including stress-free cutouts and ablations formed by chemical etching and having at least one bent portion, bent along a region of reduced thickness, said region of reduced thickness formed by chemical ablation.
Claim 3
Dependent Claim
35 words
A waveguide as recited in claim 1 which further includes a rabbet assembly region having an overlying and underlying portion, both said overlying and underlying portions comprising regions of reduced thickness formed by chemical ablation.
Claim 4
Dependent Claim
16 words
A trough waveguide as recited in claim 1 or claim 2 further including a central comb.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |