Patent US3927461A successfully refreshed from Google Patents.
US3927461A
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US
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Method of making randomly different display devices
Assignee: Individual
•
Filing: 1973-10-05
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Granted: 1975-12-23
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Expires: 1993-10-05
Abstract
Abstract Method of forming randomly different display devices using birefringent material viewed in polarized light by subjecting birefringent material to spray of water droplets followed by application of flame to same area having droplets thereon.
Inventors
- 👤 Adam Peiperl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:59
CPC Classifications
B; B29; B29C; B29C59/00; A; A63; A63H; A63H33/00; A63H33/22; B29C67/00; B29C67/0014; F; F21; F21S; F21S10/00; F21V; F21V9/00; F21V9/14; A63F; A63F9/00; A63F9/06; A63F9/0613; A63F2009/0638; B29L; B29L2031/00; B29L2031/722; B29L2031/747; B29L2031/7472; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/49812
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
91 words
A method of preparing birefringent material which is subject to fusing and warping from the heat of a flame, for use in display devices for viewing in polarized light, comprising the steps of forming the birefringent material to a desired shape, spraying said birefringent material with non-flammable, nonvolatile liquid droplets distributed to provide a random effect, applying a flame to various areas having droplets thereon wherein the areas under the droplets are protected thereby from direct heat of said flame and causing areas around the droplets to fuse partially and warp.
Claim 2
Independent Claim
91 words
A method of preparing birefringent material which is subject to fusing and warping from the heat of a flame, for use in display devices for viewing in polarized light, comprising the steps of forming the birefringent material to a desired shape, spraying said birefringent material with non-flammable, nonvolatile liquid droplets distributed to provide a random effect, applying a flame to various areas having droplets thereon wherein the areas under the droplets are protected thereby from direct heat of said flame and causing areas around the droplets to fuse partially and warp.
Claim 3
Dependent Claim
40 words
The method of claim 1, further comprising the step of mounting the birefringent material between sheets of polarizing material after applying the flame to portions of said birefringent material with a light source outside of said sheets of polarizing material.
Claim 4
Dependent Claim
15 words
The method of claim 2, further comprising the step of rotating the mounted birefringent material.
Claim 5
Dependent Claim
19 words
The method of claim 1, further characterized by overlapping of portions of said birefringent material during the forming step.
References Cited (Backward Citations)
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |