Patent US3682673A successfully refreshed from Google Patents.
US3682673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latent imaging or hidden entry system
Assignee: 3M Co
•
Filing: 1970-04-08
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Granted: 1972-08-08
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Expires: 1990-04-08
Abstract
Abstract THIS METHOD OF PROVIDING A PAPER-BASED FEEDBACK SYSTEM INVOLVES PRINTING VISIBLE ENTRIES ON A RECEPTOR SHEET; JUXTAPOSING A COATED SHEET UPON THE PRINTED SURFACE OF THE RECEPTOR SHEET, THE COATING COMPRISING A MICRONENCAPSULATED DYE PRECURSOR; CRASH IMPRINTING THE JUXTAPOSED SHEETS SUCH THAT THE RECEPTO SHEET RECEIVES A LATENT IMAGE COMPRISING THE DYE PRECURSOR; AND DEVELOPING THE LATENT IMAGE WITH A COREACTANT FOR THE DYE PRECURSOR.
Inventors
- 👤 Wendell J Manske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:32
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B44; B44F; B44F1/00; B44F1/08; B44F1/10; Y; Y10; Y10S; Y10S101/00; Y10S101/37
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |