Patent US2637657A successfully refreshed from Google Patents.
US2637657A
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US
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Thermosensitive papers and compositions therefor
Assignee: PRODUCT DEV LAB Inc
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Filing: 1946-06-10
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Granted: 1953-05-05
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Expires: 1966-06-10
Abstract
No abstract record available.
Inventors
- 👤 Karlis V Ozols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:39
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/32; Y; Y10; Y10S; Y10S430/00; Y10S430/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A THERMOSENSITIVE SALT COMPOSITION, USEFUL IN THE FORM OF A THIN ADHERENT SURFACING PROVIDED WITH A BINDER TO HOLD IT ON A FLEXIBLE CARRIER SHEET AND CAPABLE OF RECORDING A PERMANENT CONTRASTING COLORED TRACE WHEN LOCALLY HEATED TO AN ELEVATED TEMPERATURE, SAID COMPOSITION INCLUDING A BINDER AND COMPRISING 60 TO 80 PARTS BY WEIGHT OF LEAD FORMATE 5 TO 30 PARTS BY WEIGHT OF MERCURIC OXALATE 2 TO 15 PARTS BY WEIGHT OF ETHYL CELLULOSE.
Claim 2
Dependent Claim
75 words
A THERMOSENSITIVE SALT COMPOSITION, USEFUL IN THE FORM OF A THIN ADHERENT SURFACING PROVIDED WITH A BINDER TO HOLD IT ON A FLEXIBLE CARRIER SHEET AND CAPABLE OF RECORDING A PERMANENT CONTRASTING COLORED TRACE WHEN LOCALLY HEATED TO AN ELEVATED TEMPERATURE, SAID COMPOSITION INCLUDING A BINDER AND COMPRISING 60 TO 80 PARTS BY WEIGHT OF LEAD FORMATE 5 TO 30 PARTS BY WEIGHT OF MERCURIC OXALATE 2 TO 15 PARTS BY WEIGHT OF ETHYL CELLULOSE.
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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) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |