Patent US4394770A successfully refreshed from Google Patents.
Patent US3574258A successfully refreshed from Google Patents.
US3574258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a transreflector for an antenna
Assignee: United States Department of the Navy
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Filing: 1969-01-15
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Granted: 1971-04-13
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Expires: 1989-01-15
Abstract
Abstract A method of making a transreflector for an antenna comprising first preparing a grating of equally spaced parallel wires, and then attaching said gating to a flat sheet of plastic material. The sheet of plastic material is then shaped into a segment of a right circular cone having a parabolic end surface on which the spaced parallel wires are positioned, by use of a heated-vacuum die. The formed sheet of plastic material is then attached to a metallic mounting ring.
Inventors
- 👤 Charles W May
- 👤 Franklin A Porter
- 👤 John W Pickett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:29
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/141; H01Q15/142; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19; H01Q19/195; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A method of making a transreflector for a Cassegrain antenna comprising: first making an elliptical-shaped grating of spaced parallel wires by winding with a lathe copper wire onto a flat mandrel having an elliptical hole substantially in the shape of the grating to be made; then attaching said elliptical-shaped grating of spaced parallel wires to a sheet of flat plastic material; then forming said sheet of plastic material with said grating attached thereto into a segment of a right circular cone having a parabolic end surface on which said spaced parallel wires are positioned; and then attaching said formed sheet of plastic material to a metallic mounting ring.
Claim 2
Independent Claim
108 words
A method of making a transreflector for a Cassegrain antenna comprising: first making an elliptical-shaped grating of spaced parallel wires by winding with a lathe copper wire onto a flat mandrel having an elliptical hole substantially in the shape of the grating to be made; then attaching said elliptical-shaped grating of spaced parallel wires to a sheet of flat plastic material; then forming said sheet of plastic material with said grating attached thereto into a segment of a right circular cone having a parabolic end surface on which said spaced parallel wires are positioned; and then attaching said formed sheet of plastic material to a metallic mounting ring.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |