Patent US3330722A successfully refreshed from Google Patents.
US3330722A
Expired / Lapsed
US
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Method for preparing pressure-sensitive filler-containing copying paper and paper thereof
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1964-08-26
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Granted: 1967-07-11
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Expires: 1984-08-26
Abstract
No abstract record available.
Inventors
- 👤 Amano Masahiro
- 👤 Ohye Hideo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:06
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; B41M5/1555; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
AN INTERNALLY FILLED PAPER FOR USE IN FORMING PRESSURE-SENSITIVE COPYING PAPER, SAID INTERNALLY FILLED PAPER COMPRISING CELLULOSIC FIBERS, A CLAY, AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF WATER INSOLUBLE SALTS OF COBALT, MANGANESE, LEAD AND MIXTURES THEREOF, THE CLAY AND INSOLUBLE SALT BEING PRESENT IN AN AMOUNT OF 10-40% BY WEIGHT OF THE FILLED PAPER, THE SALT BEING FROM 0.3 TO 15% BY WEIGHT OF THE TOTAL OF THE CLAY AND SALT, SAID CLAY BEING AN ELECTRON ACCEPTOR CLAY CAPABLE OF DEVELOPING COLOR BY ABSORBING COLORLESS ELECTRON DONOR SELECTED FROM TRIPHENYLMETHANE PHTHALIDE COMPOUNDS AND ACYL LEUCO METHYLENE BLUE COMPOUNDS.
Claim 2
Dependent Claim
101 words
AN INTERNALLY FILLED PAPER FOR USE IN FORMING PRESSURE-SENSITIVE COPYING PAPER, SAID INTERNALLY FILLED PAPER COMPRISING CELLULOSIC FIBERS, A CLAY, AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF WATER INSOLUBLE SALTS OF COBALT, MANGANESE, LEAD AND MIXTURES THEREOF, THE CLAY AND INSOLUBLE SALT BEING PRESENT IN AN AMOUNT OF 10-40% BY WEIGHT OF THE FILLED PAPER, THE SALT BEING FROM 0.3 TO 15% BY WEIGHT OF THE TOTAL OF THE CLAY AND SALT, SAID CLAY BEING AN ELECTRON ACCEPTOR CLAY CAPABLE OF DEVELOPING COLOR BY ABSORBING COLORLESS ELECTRON DONOR SELECTED FROM TRIPHENYLMETHANE PHTHALIDE COMPOUNDS AND ACYL LEUCO METHYLENE BLUE COMPOUNDS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |