US4178404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Immersed reticle
Assignee: United States Department of the Navy
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Filing: 1978-02-06
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Granted: 1979-12-11
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Expires: 1998-02-06
Abstract
Abstract A low reflectance reticle immersed in optical cement between transparent strates. A copper reticle is vacuum deposited upon one transparent substrate and chemically treated to produce anti-reflectance properties. The reticle and substrate to which it is attached are then cemented with optical cement to a second transparent substrate to immerse the anti-reflectance reticle between tranparent substrates in optical cement. The immersed reticle thus formed has superior anti-reflection properties and is protected from mechanical damage by its immersed location. Immersed reticles may be installed between elements of a compound lens if desired.
Inventors
- 👤 Edwin M. Allen
- 👤 William C. Fitzgerald
- 👤 Henry Blazek
- 👤 George Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:02
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115; G02B1/116; G02B27/00; G02B27/32; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
42 words
A metallic reticle, comprising: a transparent optical substrate; a layer of titanium attached to said transparent optical substrate; a layer of copper attached to said layer of titanium, said layer of copper having an oxidized surface characterized by fine feathery dendritic clusters.
Claim 2
Dependent Claim
42 words
A metallic reticle, comprising: a transparent optical substrate; a layer of titanium attached to said transparent optical substrate; a layer of copper attached to said layer of titanium, said layer of copper having an oxidized surface characterized by fine feathery dendritic clusters.
Claim 3
Dependent Claim
26 words
A metallic reticle according to claim 1 wherein said fine feathery dendritic clusters have diameters of up to 0.2 microns, and lengths up to 5 microns.
Claim 4
Dependent Claim
20 words
A compound optical element according to claim 1 wherein said transparent optical substrate comprises an element of a compound lens.
References Cited (Backward Citations)
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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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |