US4173474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hologram and method of production using two solvent treatments
Assignee: Canon Inc
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Filing: 1977-07-27
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Granted: 1979-11-06
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Expires: 1997-07-27
Abstract
Abstract A hologram comprises a polymer carrier and a portion composed of a polymerization product of a photopolymerizable monomer contained in the polymer carrier, and the polymerization product is produced by exposing the carrier polymer containing the photopolymerizable monomer to an interference pattern of radiation.
Inventors
- 👤 Takashi Tanaka
- 👤 Katsuhiko Nishide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:00
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/0005; G03F7/001; G03H; G03H1/00; G03H1/02; G03H1/024; G03H1/0248; G03H1/04; G03H1/18; G03H1/182; G03H2001/186; G03H2240/00; G03H2240/50; G03H2240/54; G03H2260/00; G03H2260/12; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
A method of producing a hologram comprising: (A) a first step wherein a sensitive member is prepared by dispersing a photopolymerizable substance into a polymer by which a carrier is formed, (B) a second step of exposing said member to an interference pattern of radiation rays, (C) a third step of contacting the exposed sensitive member with a first solvent capable of providing a difference in swelling in accordance with the interference pattern formed in the sensitive member, and (D) a fourth step of contacting the exposed sensitive member with a second solvent which is miscible with the first solvent, but relatively weak in swelling action to the sensitive member whereby a hologram having an unexpectedly high diffraction efficiency relative to the thickness of the sensitive member is formed.
Claim 2
Independent Claim
129 words
A method of producing a hologram comprising: (A) a first step wherein a sensitive member is prepared by dispersing a photopolymerizable substance into a polymer by which a carrier is formed, (B) a second step of exposing said member to an interference pattern of radiation rays, (C) a third step of contacting the exposed sensitive member with a first solvent capable of providing a difference in swelling in accordance with the interference pattern formed in the sensitive member, and (D) a fourth step of contacting the exposed sensitive member with a second solvent which is miscible with the first solvent, but relatively weak in swelling action to the sensitive member whereby a hologram having an unexpectedly high diffraction efficiency relative to the thickness of the sensitive member is formed.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1, wherein said hologram is a volume phase hologram.
Claim 4
Dependent Claim
16 words
A method as claimed in claim 1, wherein said polymer is a hydrophilic high molecular substance.
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1, wherein said polymer is a hydrophobic high molecular substance.
Claim 6
Dependent Claim
18 words
A method as claimed in claim 1, wherein said photopolymerizable substance is a compound containing ethylenic unsaturated bond.
Claim 7
Dependent Claim
16 words
A method as claimed in claim 1, wherein said photopolymerizable substance is a water soluble monomer.
Claim 8
Dependent Claim
23 words
A method as claimed in claim 1, wherein a step for dissolving away unpolymerized photopolymerizable substance is effected between steps (B) and (C).
Claim 9
Dependent Claim
21 words
A method as claimed in claim 1, wherein the first solvent in step (C) is capable of dissolving unpolymerized photopolymerizable substance.
Claim 10
Dependent Claim
126 words
A hologram produced by (A) a first step wherein a sensitive member is prepared by dispersing a photopolymerizable substance into a polymer by which a carrier is formed, (B) a second step of exposing said member to an interference pattern of radiation rays, (C) a third step of contacting the exposed sensitive member with a first solvent capable of providing a difference in swelling in accordance with the interference pattern formed in the sensitive member, and (D) a fourth step of contacting the exposed sensitive member with a second solvent which is miscible with the first solvent, but relatively weak in swelling action to the sensitive member whereby a hologram having an unexpectedly high diffraction efficiency relative to the thickness of the sensitive member is formed.
Claim 11
Dependent Claim
126 words
A hologram produced by (A) a first step wherein a sensitive member is prepared by dispersing a photopolymerizable substance into a polymer by which a carrier is formed, (B) a second step of exposing said member to an interference pattern of radiation rays, (C) a third step of contacting the exposed sensitive member with a first solvent capable of providing a difference in swelling in accordance with the interference pattern formed in the sensitive member, and (D) a fourth step of contacting the exposed sensitive member with a second solvent which is miscible with the first solvent, but relatively weak in swelling action to the sensitive member whereby a hologram having an unexpectedly high diffraction efficiency relative to the thickness of the sensitive member is formed.
References Cited (Backward Citations)
US3567444A
Cited
US3658526A
Cited
US3660091A
Cited
US3667946A
Cited
US4029507A
Cited
US3925077A
Cited
US3945825A
Cited
US4049459A
Cited
US4055423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |