Patent USRE28876E successfully refreshed from Google Patents.
Patent US3684552A successfully refreshed from Google Patents.
US3684552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive sheet material
Assignee: 3M Co
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Filing: 1970-11-16
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Granted: 1972-08-15
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Expires: 1990-11-16
Abstract
Abstract COLORED SHEET MATERIAL, PREFERABLY IN CLEAR FILM FORM, CONTAINS AN AMINE-REACTIVE DYE AND A TETRALKYLAMMONIUM CYANOACETATE SALT DISSOLVED IN A BINDER. WHEN SUBJECTED TO A THERMOGRAPHICALLY INDUCED HEAT-PATTERN THE COLOR IS PERMANENTLY DIMINISHED OR DESTROYED, PRODUCING A VISIBLE IMAGE AND, WHEN USING THE PREFERRED FILM PRODUCT, A NEGATIVE PROJECTION TRANSPARENCY.
Inventors
- 👤 Joseph A Wiese Jr
- 👤 George Van Dyke Tiers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:23
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/28; G; G03; G03F; G03F1/00; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/918; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |