Patent US3999301A successfully refreshed from Google Patents.
US3999301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reticle-lens system
Assignee: United States Department of the Navy
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Filing: 1975-07-24
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Granted: 1976-12-28
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Expires: 1995-07-24
Abstract
Abstract A method of producing an optical reticle and the reticle produced thereby. thin layer of aluminum is deposited on the face of a sapphire substrate and a reticle pattern is chemically etched therein. The system is then exposed to air at an elevated temperature for approximately one hour to oxidize the remaining aluminum layer. A film of titanium is next placed over the rough aluminum oxide as by sputtering, for example, and the excess titanium is etched away by the same pattern to produce the finished reticle.
Inventors
- 👤 Robert E. Hunt
- 👤 Kenneth L. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:38
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/32; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
50 words
A reticle for use in a radiant energy detection system, said reticle comprising: a transparent substrate; a patterned layer of aluminum oxide overlying said substrate, said patterned layer having a rough surface; and an opaque film of titanium overlying said patterned layer of aluminum oxide and contacting said rough surface.
Claim 2
Dependent Claim
50 words
A reticle for use in a radiant energy detection system, said reticle comprising: a transparent substrate; a patterned layer of aluminum oxide overlying said substrate, said patterned layer having a rough surface; and an opaque film of titanium overlying said patterned layer of aluminum oxide and contacting said rough surface.
Claim 3
Dependent Claim
11 words
The reticle of claim 1 wherein said transparent substrate comprises sapphire.
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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |