Patent US3829401A successfully refreshed from Google Patents.
US3829401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sensitive recording paper
Assignee: Mitsubishi Paper Mills Ltd
•
Filing: 1972-10-25
•
Granted: 1974-08-13
•
Expires: 1992-10-25
Abstract
Abstract IN THE HEAT SENSITIVE RECORDING SYSTEM COMPRISING COMBINATION OF A COLOR FORMING COMPOUND AND A PHENOL COMPOUND, THE FADING OF THE HEAT RECORDING COMPOSITION IN THE DARK CAN BE PREVENTED BY ALLOWING A PHENOL RESIN TO BE PRESENT IN THE HEAT SENSITIVE LAYER OR IN CONTACT WITH THE LAYER. SAID PHENOL RESIN IS THE ONE OBTAINED BY CONDENSATION OF AT LEAST ONE LOWER ALPIPHATIC ALDEHYDES, LOWER ALIPHARIC ALDEHYDE PRODUCING AGENT AND LOWER ALKYLVINYL ESTERS AND A PHENYL COMPOUND HAVING 3 OR MORE ORTHO-AND/OR PARA-POSITIONS (TO PHENOLIC HYDROXYL GROUP) HAVING NO MORE SUBSTITUENTS.
Inventors
- 👤 K Futaki
- 👤 K Haino
- 👤 I Kohmura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:33
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3372
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |