US3933504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photochromic lithium niobate and method for preparing same
Assignee: RCA Corp
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Filing: 1973-11-19
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Granted: 1976-01-20
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Expires: 1993-11-19
Abstract
Abstract Photochromic lithium niobate crystals containing iron and either manganese or copper are useful for recording phase holograms in the photosensitive state of the crystals, which holograms can be permanently fixed and read out without loss in the quality of the image obtained therefrom over extended periods.
Inventors
- 👤 William Phillips
- 👤 David Lloyd Staebler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:23
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/725; G03H; G03H1/00; G03H1/02; G03H2001/026; G03H2001/0268; G03H2260/00; G03H2260/50; G03H2260/52; G03H2260/54
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
36 words
Photochromic lithium niobate containing at least about 0.001 mol percent of iron as a first dopant and at least about 0.001 mol percent of a second dopant selected from the group consisting of manganese and copper.
Claim 2
Dependent Claim
36 words
Photochromic lithium niobate containing at least about 0.001 mol percent of iron as a first dopant and at least about 0.001 mol percent of a second dopant selected from the group consisting of manganese and copper.
Claim 3
Dependent Claim
16 words
Lithium niobate according to claim 1 containing up to about 0.15 mol percent of each dopant.
Claim 4
Dependent Claim
18 words
Lithium niobate according to claim 1 containing from about 0.001 to about 0.05 mol percent of each dopant.
Claim 5
Dependent Claim
12 words
Lithium niobate according to claim 3 wherein the second dopant is manganese.
References Cited (Backward Citations)
US3703328A
Cited
US3773400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |