Patent US3278327A successfully refreshed from Google Patents.
US3278327A
Expired / Lapsed
US
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Colorless recording paper
Assignee: Warren SD Co
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Filing: 1964-06-03
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Granted: 1966-10-11
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Expires: 1984-06-03
Abstract
No abstract record available.
Inventors
- 👤 Davis Chester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:50
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/025; B41M5/0253; B41M5/26; B41M5/30; B41M5/323; Y; Y10; Y10S; Y10S101/00; Y10S101/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A TRANSFER SHEET HAVING UPON ITS SURFACE A COATING CONTAINING A SUBSTANTIALLY COLORLESS DYE SALT DERIVED FROM AN ORGANIC SULFINIC ACID AND AN ARYLMETHANE DYE BASE CHARACTERIZED BY A LOGARTHMIC DISSOCIATION CONSTANT BELOW 7, WHICH UPON TRANSFER TO A SUITABLE RECEIVING SHEET IS DISSOCIATED TO THE INTENSELY COLORED IONIC FORM OF THE DYE TO FURNISH A COLORED PAINT.
Claim 2
Dependent Claim
58 words
A TRANSFER SHEET HAVING UPON ITS SURFACE A COATING CONTAINING A SUBSTANTIALLY COLORLESS DYE SALT DERIVED FROM AN ORGANIC SULFINIC ACID AND AN ARYLMETHANE DYE BASE CHARACTERIZED BY A LOGARTHMIC DISSOCIATION CONSTANT BELOW 7, WHICH UPON TRANSFER TO A SUITABLE RECEIVING SHEET IS DISSOCIATED TO THE INTENSELY COLORED IONIC FORM OF THE DYE TO FURNISH A COLORED PAINT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |