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US3790245A Expired / Lapsed US ⏱️ 0.0 years remaining

Double-sided holographic replicas

Assignee: RCA Corp
•
Filing: 1972-10-12
•
Granted: 1974-02-05
•
Expires: 1992-10-12
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Abstract

Abstract A double-sided, holographic replica comprises a web of transparent, thermoplastic, sheet material having a separate series of off-axis-recorded, phase-modulated holograms pressed into each of the opposite surfaces, respectively, of the web. Oppositely disposed (front and rear) holograms are such as to provide angularly displaced reconstructed images, respectively, when a monochromatic read-out beam is transmitted through the web. The double-sided holographic replica is made by first pressing the web and a first holographic master between a first pair of heated calender rollers to form one replica on one surface of the web, and then pressing the web, while thermoplastically adhered to the first master, and a second holographic master between a second pair of heated calender rollers to form another replica on the other surface of the web. The first and second masters are subsequently cooled and separated from the web.

Inventors

  • 👤 W Hannan
  • 👤 J Frattarola

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 00:23
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; B; B29; B29C; B29C59/00; B29C59/02; B29C59/04; G; G03; G03H; G03H1/00; G03H1/02; G03H1/0276; G03H1/028; H04N5/89; B29L; B29L2031/00; B29L2031/722; B29L2031/7224; G03H1/024; G03H1/0244; G03H1/26; G03H2001/2605; G03H2001/261; G03H2001/2615; G03H2227/00; G03H2227/04

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 76 words
An information recording medium consisting of substantially homogeneous transparent sheet material having formed in each of the opposite surfaces thereof a separate relief pattern, each of said separate relief patterns comprising a tilted off-axis recorded transmission hologram formed by object and reference beams which define a plane oblique to the longitudinal axis of the hologram, said oppositely disposed relief patterns providing angularly displaced reconstructed images when a monochromatic read-out beam is transmitted through the sheet material.
Claim 2
Dependent Claim 76 words
An information recording medium consisting of substantially homogeneous transparent sheet material having formed in each of the opposite surfaces thereof a separate relief pattern, each of said separate relief patterns comprising a tilted off-axis recorded transmission hologram formed by object and reference beams which define a plane oblique to the longitudinal axis of the hologram, said oppositely disposed relief patterns providing angularly displaced reconstructed images when a monochromatic read-out beam is transmitted through the sheet material.
Claim 3
Dependent Claim 19 words
An information recording medium as described in claim 1, wherein said sheet material is a web of thermoplastic material.
Claim 4
Dependent Claim 23 words
An infoRmation recording medium as described in claim 1, wherein said relief patterns having a depth in the range between 5 and 2,000A.
Claim 5
Dependent Claim 33 words
An information recording medium as described in claim 1, wherein said sheet material has a thickness of between about 1 and 6 mils, and said holograms have a resolution of about one micron.
Claim 6
Dependent Claim 32 words
An information recording medium as described in claim 1, wherein said sheet material is cast vinyl, and said holograms formed in said opposite surfaces of said sheet material are opposite each other.
Claim 7
Dependent Claim 30 words
An information recording medium as described in claim 5, wherein said cast vinyl sheet material has an elongation befure rupture of less than, or equal to, 5 percent at 25*C.

References Cited (Backward Citations)

US3430966A Cited
US3565978A Cited
US3619025A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-02-04 1977-08-06 1978-02-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-02-04 1981-08-06 1982-02-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-02-04 1985-08-06 1986-02-05 $7700.00 Window Closed / Lapsed

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