Patent US5013494A successfully refreshed from Google Patents.
US5013494A
Expired / Lapsed
US
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Process for preparing blazed holograms
Assignee: Sharp Corp
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Filing: 1989-08-01
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Granted: 1991-05-07
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Expires: 2009-08-01
Abstract
Abstract A process for preparing blazed holograms suitable for mass-production which includes fabricating a glass or metal plate having a surface of serrated cross section, disposing the glass or metal plate in an injection mold to allow the surface of serrated cross section to constitute an inner surface of the mold. Then injecting an acrylic resin in molten form into the mold under a specific molding pressure, and removing a molded acrylic resin from the glass plate or metal plate to obtain an acrylic blazed hologram.
Inventors
- 👤 Katsuhiro Kubo
- 👤 Keiji Sakai
- 👤 Yukio Kurata
- 👤 Hideyoshi Yamaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:18
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/0074; B29D11/00769; G; G03; G03H; G03H1/00; G03H1/02; B29C; B29C45/00; B29C45/0001; B29C45/17; B29C45/26; B29C45/37; B29C45/372; G03H1/024; G03H1/0244; G03H1/0276; B29L; B29L2031/00; B29L2031/722; B29L2031/7224; G03H2001/0208; G03H2001/0212; G03H2001/0284; G03H2001/0288; G03H2260/00; G03H2260/14; G03H2260/50; G03H2260/63; G03H2270/00; G03H2270/10; G03H2270/11
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A process for preparing blazed holograms which comprises fabricating a glass or metal plate having a surface of serrated cross section corresponding to a desired blazed grating pattern, disposing the glass or metal plate in an injection mold to allow the surface of serrated cross section to constitute an inner surface of the mold, injecting an acrylic resin in molten form into the mold under molding pressure of 1500 kgf/cm 2 or more and removing a molded acrylic resin from the glass or metal plate to obtain an acrylic blazed hologram.
Claim 2
Dependent Claim
91 words
A process for preparing blazed holograms which comprises fabricating a glass or metal plate having a surface of serrated cross section corresponding to a desired blazed grating pattern, disposing the glass or metal plate in an injection mold to allow the surface of serrated cross section to constitute an inner surface of the mold, injecting an acrylic resin in molten form into the mold under molding pressure of 1500 kgf/cm 2 or more and removing a molded acrylic resin from the glass or metal plate to obtain an acrylic blazed hologram.
Claim 3
Dependent Claim
20 words
The process of claim 1 in which the acrylic resin is a poly-lower (C 1-5 ) alkyl acrylate or methacrylate.
Claim 4
Dependent Claim
12 words
The process of claim 1 in which the acrylic resin is polymethylmethacrylate.
Claim 5
Dependent Claim
17 words
The process of claim 1 in which the molding pressure is 1500 to 3100 kgf/cm 2 .
Claim 6
Dependent Claim
24 words
The process of claim 1 in which the acrylic resin is injected at a temperature in the range from about 200 to 270° C.
Claim 7
Dependent Claim
28 words
The process of claim 1 in which the acrylic blazed hologram has a surface of serrated cross section of 1.5-2.5 μm in pitch and 0.6-0.8 μm in depth.
Claim 8
Dependent Claim
19 words
The process of claim 1 in which the acrylic blazed hologram has a thickness of 1 to 3 mm.
Claim 9
Dependent Claim
21 words
The process of claim 1 in which the molding is repeated for mass-production using the single glass plate or metal plate.
Claim 10
Dependent Claim
39 words
The process of claim 1 in which the glass plate having a surface of serrated cross section is one fabricated by an etching treatment of a glass substrate the surface of which is coated with a photo resist pattern.
Claim 11
Dependent Claim
39 words
The process of claim 1 in which the metal plate having a surface of serrated cross section is one fabricated by electrocasting of a metal over a glass or synthetic resin substrate having a surface of serrated cross section.
Claim 12
Dependent Claim
17 words
A method according to claim 1 wherein the replica is annealed to remove internal stress after molding.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |