US2799167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature indicators
Assignee: Individual
•
Filing: 1953-02-12
•
Granted: 1957-07-16
•
Expires: 1973-02-12
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Loconti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:21
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/26; G; G01; G01K; G01K11/00; G01K11/06; G01K11/12; Y; Y10; Y10S; Y10S116/00; Y10S116/14; Y10S252/00; Y10S252/962
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PAPER THERMOMETER COMPRISING A HIGHLY ABSORBENT BLACK PAPER, AND SEQUENTIALLY ARRANGED THEREON DEPOSITS OF FINELY DIVIDED WHITE SUBSTANTIALLY WATER-INSOLUBLE CRYSTALLINE ORGANIC PIGMENTS HAVING SHARPLY DEFINED MELTING POINTS, EACH OF SAID PIGMENTS BEING INTIMATELY ADMIXED WITH A WATER-SOLUBLE SOLID BINDER, COMPATIBLE WITH SAID PIGMENT AND SAID DEPOSITS BEING ARRANGED IN THE ORDER OF THEIR RESPECTIVE MELTING POINTS; WHEREBY WHEN AN UPWARD CHANGE IN THERMAL CONDITIONS WITHIN THE RANGE OF THE MELTING POINTS OF SAID PIGMENTS ACCURS, SAID PIGMENTS MELT IN THE ORDER OF THEIR RESPECTIVE MELTING POINTS AND ARE SUCCESSIVELY ABSORBED BY SAID BLACK PAPER, WHICH RESULTS IN A READILY OBSERVABLE IRREVERSIBLE CHANGE OF THE APPEARANCE OF THAT AREA OF SAID PAPER THERMOMETER WHICH CARRIES COMPOUNDS HAVING A MELTING POINT LOWER THAN THE HIGHEST TEMPERATURE REACHED IN THE COURSE OF SAID CHANGE IN THERMAL CONDITIONS.
Claim 2
Dependent Claim
135 words
A PAPER THERMOMETER COMPRISING A HIGHLY ABSORBENT BLACK PAPER, AND SEQUENTIALLY ARRANGED THEREON DEPOSITS OF FINELY DIVIDED WHITE SUBSTANTIALLY WATER-INSOLUBLE CRYSTALLINE ORGANIC PIGMENTS HAVING SHARPLY DEFINED MELTING POINTS, EACH OF SAID PIGMENTS BEING INTIMATELY ADMIXED WITH A WATER-SOLUBLE SOLID BINDER, COMPATIBLE WITH SAID PIGMENT AND SAID DEPOSITS BEING ARRANGED IN THE ORDER OF THEIR RESPECTIVE MELTING POINTS; WHEREBY WHEN AN UPWARD CHANGE IN THERMAL CONDITIONS WITHIN THE RANGE OF THE MELTING POINTS OF SAID PIGMENTS ACCURS, SAID PIGMENTS MELT IN THE ORDER OF THEIR RESPECTIVE MELTING POINTS AND ARE SUCCESSIVELY ABSORBED BY SAID BLACK PAPER, WHICH RESULTS IN A READILY OBSERVABLE IRREVERSIBLE CHANGE OF THE APPEARANCE OF THAT AREA OF SAID PAPER THERMOMETER WHICH CARRIES COMPOUNDS HAVING A MELTING POINT LOWER THAN THE HIGHEST TEMPERATURE REACHED IN THE COURSE OF SAID CHANGE IN THERMAL CONDITIONS.
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US1668767A
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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) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |