Patent US3674538A successfully refreshed from Google Patents.
US3674538A
Expired / Lapsed
US
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Heat-sensitive sheet
Assignee: Panasonic Holdings Corp
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Filing: 1969-04-08
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Granted: 1972-07-04
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Expires: 1989-04-08
Abstract
Abstract A HEAT-SENSITIVE SHEET USING A MIXTURE OF P-CRESYL PHOSPHATE AND OTHER ORGANIC PSHOSPHORIC ACID ESTERS SUCH AS TRIPHENYL PHOSPHATE, TRIBUTYL PHOSPHATE, 2 - ETHYLHEXYL PHOSPHATE AND MIXTURES OF TRICRESYL PHOSPHATE ISOMERS.
Inventors
- 👤 Takashi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:05
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/398; Y; Y10; Y10S; Y10S428/00; Y10S428/913
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |