Patent US3708378A successfully refreshed from Google Patents.
US3708378A
Expired / Lapsed
US
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Heat-sensitive retro-reflective imaging sheet
Assignee: 3M Co
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Filing: 1970-11-27
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Granted: 1973-01-02
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Expires: 1990-11-27
Abstract
Abstract A HEAT-SENSITIVE IMAGING SHEET ON WHICH IMAGES THAT ARE RETRO-REFLECTIVE MAY BE RAPIDLY DEFINED. THE SHEET IN CLUDES AN IMAGING LAYER THAT IS EITHER NORMALLY TRANSPARENT AND CONVERTED TO OPAQUE IN SELECTED AREAS OR NORMALLY OPAQUE AND CONVERTED TO TRANSPARENT IN SELECTED AREAS WHEN HEATED IN THOSE AREAS. THE IMAGING SHEET ALSO INCLUDES A RETRO-REFLECTIVE LAYER DISPOSED UNDERNEATH THE IMAGING LAYER SO THAT LIGHT BEAMED AGAINST THE SHEET WILL BE RETRO-REFLECTED BY THE PORTIONS OF THE RETRO-REFLECTIVE LAYER EXOSED THROUGH TRANSPARENT AREAS OF THE IMAGING LAYER. D R A W I N G
Inventors
- 👤 C Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:39
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/42; B41M5/426; B44; B44F; B44F1/00; B44F1/02; B44F1/04; G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/4989; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/918; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24364; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 0
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |