US4554565A
Expired / Lapsed
US
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Method of producing reversible thermochromic display
Assignee: Pilot Ink Co Ltd
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Filing: 1984-04-06
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Granted: 1985-11-19
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Expires: 2004-04-06
Abstract
Abstract A method for producing a reversible thermochromic display composed of multiple, overlapping color images. In accordance with the invention, a plurality of overlapping colored image layers are formed on a support, at least one of which layers provides a reversible thermochromic image. Each of the images on the various layers has a different visual density, and at least one reversible thermochromic image changes color at a temperature below or above a predetermined temperature and provides a color which is more intense and more easily discernible than the colors of the other ones of the images.
Inventors
- 👤 Tutomu Kito
- 👤 Norikazu Nakasuji
- 👤 Takashi Kataoka
- 👤 Hiroshi Inagaki
- 👤 Yutaka Shibahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:02
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/28; B41M5/282; B41M5/284; G; G01; G01K; G01K11/00; G01K11/12; B41M5/30; B41M5/305; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24835
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
In a method for forming a reversible thermochromic display, the improvement comprising: forming a plurality of overlapping colored image layers on a support, at least one of said layers providing reversible thermochromic image, said layers being so arranged to provide images having different visual densities, and the image on one of said layers being visible at any particular temperature range, and upon temperature change, the image on any reversible thermochromic layer becoming paler or darker than the densities of other images to develop an image more discernible from said already visible image.
Claim 2
Dependent Claim
92 words
In a method for forming a reversible thermochromic display, the improvement comprising: forming a plurality of overlapping colored image layers on a support, at least one of said layers providing reversible thermochromic image, said layers being so arranged to provide images having different visual densities, and the image on one of said layers being visible at any particular temperature range, and upon temperature change, the image on any reversible thermochromic layer becoming paler or darker than the densities of other images to develop an image more discernible from said already visible image.
Claim 3
Dependent Claim
26 words
The method according to claim 1, wherein one of said colored image layers provides a nonthermochromic image which is paler than said thermochromic image when developed.
Claim 4
Dependent Claim
21 words
The method according to claim 1, wherein all of said overlapping image layers provide reversible thermochromic images having different thermochromic temperatures.
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) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |