Patent US4720158A successfully refreshed from Google Patents.
US4720158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for making a hologram
Assignee: Canon Inc
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Filing: 1984-12-05
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Granted: 1988-01-19
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Expires: 2004-12-05
Abstract
Abstract In a method of making a hologram by causing a plurality of light beams to interfere with one another, a new hologram is made by the use of the reproduced lights from a plurality of holograms made on the same substrate.
Inventors
- 👤 Tetsuro Kuwayama
- 👤 Yasuo Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:06
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/20; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
A method of making a hologram comprising the steps of: forming a first hologram for producing an object light beam and a second hologram for producing a reference light beam on the same plane of a plane substrate; and illuminating said first and second holograms formed on said same plane of the plane substrate and forming a third hologram by the light beams from said two holograms.
Claim 2
Independent Claim
67 words
A method of making a hologram comprising the steps of: forming a first hologram for producing an object light beam and a second hologram for producing a reference light beam on the same plane of a plane substrate; and illuminating said first and second holograms formed on said same plane of the plane substrate and forming a third hologram by the light beams from said two holograms.
Claim 3
Dependent Claim
53 words
An optical system for making a hologram comprising: a master hologram plate having a first hologram for producing an object light beam and a second hologram for producing a reference light beam formed on the same plane of a plane substrate; and illuminating means for illuminating the holograms on said master hologram plate.
Claim 4
Dependent Claim
53 words
An optical system for making a hologram comprising: a master hologram plate having a first hologram for producing an object light beam and a second hologram for producing a reference light beam formed on the same plane of a plane substrate; and illuminating means for illuminating the holograms on said master hologram plate.
Claim 5
Dependent Claim
85 words
An optical system for making a hologram comprising: a master hologram plate having a first hologram for producing an object light beam and a second hologram for producing a reference light beam formed on the same substrate; illuminating means for illuminating the hologram on said master hologram plate; and means for intercepting undesired transmitted and diffracted light produced by the holograms on said master hologram plate so as not to enter into the third hologram, when the holograms of the master hologram plate are illuminated.
Claim 6
Dependent Claim
85 words
An optical system for making a hologram comprising: a master hologram plate having a first hologram for producing an object light beam and a second hologram for producing a reference light beam formed on the same substrate; illuminating means for illuminating the hologram on said master hologram plate; and means for intercepting undesired transmitted and diffracted light produced by the holograms on said master hologram plate so as not to enter into the third hologram, when the holograms of the master hologram plate are illuminated.
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) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |