US4076371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic recording material for infrared radiation
Assignee: Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV
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Filing: 1976-08-12
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Granted: 1978-02-28
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Expires: 1996-08-12
Abstract
Abstract A composite material for recording holograms with infrared radiation. The terial includes a substrate and an IR-absorbing recording layer. Infrared radiation is absorbed by the recording layer whereupon the optical thickness of recording layer is changed in the areas exposed to infrared radiation.
Inventors
- 👤 Werner Braun
- 👤 Gernot Decker
- 👤 Horst Rohr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:22
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/36; G; G03; G03H; G03H1/00; G03H1/02; G03H1/0252; G03H1/0256; G03H1/04; G03H1/0402; G03H2001/0441; G03H2222/00; G03H2222/10; G03H2222/16; G03H2260/00; G03H2260/50; G03H2260/61; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31623
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
A method for recording holograms, comprising the steps of: providing a substrate: providing on said substrate a single layer, said layer consisting of substantially pure gelatin capable of absorbing infrared radiation and having a thickness which is greater than the change in thickness caused by the contemplated exposure to the infrared radiation; generating a holographic pattern using infrared laser radiation; and exposing the layer to the holographic patterned infrared laser radiation to cause changes in the optical thickness thereof.
Claim 2
Independent Claim
79 words
A method for recording holograms, comprising the steps of: providing a substrate: providing on said substrate a single layer, said layer consisting of substantially pure gelatin capable of absorbing infrared radiation and having a thickness which is greater than the change in thickness caused by the contemplated exposure to the infrared radiation; generating a holographic pattern using infrared laser radiation; and exposing the layer to the holographic patterned infrared laser radiation to cause changes in the optical thickness thereof.
Claim 3
Dependent Claim
18 words
The method according to claim 1, wherein the step of providing a substrate comprises providing a transparent substrate.
Claim 4
Dependent Claim
18 words
The method according to claim 2, wherein the step of providing a substrate comprises providing a glass substrate.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |