US3725104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of providing and developing hidden entries
Assignee: 3M Co
•
Filing: 1970-03-26
•
Granted: 1973-04-03
•
Expires: 1990-03-26
Abstract
Abstract THE DISCOLORED PAPER-BASED FEEDBACK SYSTEMS EMPLOY THERMOGRAPHIC PROCESSES WHICH TRANSFER A PATTERN OF
Inventors
- 👤 R Fraik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:19
CPC Classifications
A; A63; A63F; A63F3/00; A63F3/06; A63F3/065; A63F3/0685; B; B41; B41M; B41M5/00; B41M5/025; B41M5/035; B41M5/0356; Y; Y10; Y10S; Y10S430/00; Y10S430/145
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |