US4138889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ready-reading, liquid-crystal-display thermometer
Assignee: Laboratorio Farmacologico Milanese SNC
•
Filing: 1978-04-13
•
Granted: 1979-02-13
•
Expires: 1998-04-13
Abstract
Abstract A strip thermometer of the liquid-crystal type for clinical use is disclosed, in which the melting point of the liquid crystals in the several display points of the strip is the temperature of an easily accessible area of the patient's body, the scale of the digital values being shifted so as to indicate the temperature of another area of the patient's body which corresponds to the temperature which is read out in the part of the body wherein the temperature readings are actually taken.
Inventors
- 👤 Mario Fraschini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/12; G01K11/16; G01K11/165; G01K13/00; G01K13/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
A thermometer for clinical use, of the type comprising a supporting member of a transparent plastics material, having windows in correspondence with which digital indications are applied which can be viewed by transparency, each window being coated by a composition of microencapsulated cholesteric liquid crystals sensitive to a pre-selected temperature, the layer of microencapsulated liquid crystals being coated, in its turn, by a very dark masking layer, characterized in that the compositions of liquid crystals are so preset as to change their state at a temperature different from that indicated by the digital corresponding value, that is, to change their state at the temperature that the body area on which the readings are taken actually has when the armpit or the groin region has the temperature displayed by the digital value.
Claim 2
Dependent Claim
131 words
A thermometer for clinical use, of the type comprising a supporting member of a transparent plastics material, having windows in correspondence with which digital indications are applied which can be viewed by transparency, each window being coated by a composition of microencapsulated cholesteric liquid crystals sensitive to a pre-selected temperature, the layer of microencapsulated liquid crystals being coated, in its turn, by a very dark masking layer, characterized in that the compositions of liquid crystals are so preset as to change their state at a temperature different from that indicated by the digital corresponding value, that is, to change their state at the temperature that the body area on which the readings are taken actually has when the armpit or the groin region has the temperature displayed by the digital value.
Claim 3
Dependent Claim
54 words
A thermometer for clinical use according to claim 1, characterized in that said body area on which temperature readings are taken is the patient's forehead and the liquid crystal compositions are preset to change their state at a temperature which is exceeded by 2° C.-3° C. (temperature differential) by the corresponding displayed digital value.
References Cited (Backward Citations)
US3661142A
Cited
US3704625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |