US4986670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature measurement device
Assignee: MINISTRY OF INTERNATIONAL TRADE
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Filing: 1989-11-17
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Granted: 1991-01-22
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Expires: 2009-11-17
Abstract
Abstract A temperature measurement device is provided with a temperature sensing element which contains a quartz resonator having a quartz oscillating crystal whose ratio of width to thickness is in the range of 9.48 to 9.69, and an antenna which receives stimulus for the quartz oscillating crystal and transmits waves of reverberatory oscillation. The temperature measurement device is capable of measuring temperatures in the range of normal room temperature to extremely low temperatures (4° K.).
Inventors
- 👤 Futoshi Uchiyama
- 👤 Ko Agatsuma
- 👤 Takeshi Ohara
- 👤 Koichi Tsukamoto
- 👤 Sumiyuki Ishigami
- 👤 Mitsuru Sato
- 👤 Hisashi Sugimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:41
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
213 words
A temperature measurement device for measuring temperatures in the range of normal room temperature to extremely low temperature comprising: a temperature sensing element located in a region, the temperature of which is to be measured; and a main measurement unit locate outside the region so as not to contact said temperature sensing element, in which said temperature sensing element includes a quartz resonator having a quartz oscillating crystal whose ratio of width to thickness is in the range of 9.48 to 9.69, and first antenna means which is connected to said quartz oscillator for receiving radio wave signals for stimulating said quartz oscillator and for transmitting radio wave signals of reverberatory oscillation waves from said quartz oscillator, and said main measurement unit includes second antenna means for transmitting radio wave signals for stimulating said quartz oscillator and for receiving said radio wave signals of the reverberatory oscillation waves from said first antenna means, means for identifying the resonant frequency of the quartz oscillating crystal based on the radio wave signals received by said second antenna means and conversion means for converting the resonant frequency identified into a temperature in the region wherein the temperature in the region is in the range of normal room temperature to the extremely low temperature of 4° K.
Claim 2
Dependent Claim
213 words
A temperature measurement device for measuring temperatures in the range of normal room temperature to extremely low temperature comprising: a temperature sensing element located in a region, the temperature of which is to be measured; and a main measurement unit locate outside the region so as not to contact said temperature sensing element, in which said temperature sensing element includes a quartz resonator having a quartz oscillating crystal whose ratio of width to thickness is in the range of 9.48 to 9.69, and first antenna means which is connected to said quartz oscillator for receiving radio wave signals for stimulating said quartz oscillator and for transmitting radio wave signals of reverberatory oscillation waves from said quartz oscillator, and said main measurement unit includes second antenna means for transmitting radio wave signals for stimulating said quartz oscillator and for receiving said radio wave signals of the reverberatory oscillation waves from said first antenna means, means for identifying the resonant frequency of the quartz oscillating crystal based on the radio wave signals received by said second antenna means and conversion means for converting the resonant frequency identified into a temperature in the region wherein the temperature in the region is in the range of normal room temperature to the extremely low temperature of 4° K.
Claim 3
Dependent Claim
16 words
The temperature measurement device of claim 1 in which the first antenna is a loop antenna.
Claim 4
Dependent Claim
23 words
The temperature measurement device of claim 1 in which said temperature sensing element also contains an impedance element connected to said quartz resonator.
Claim 5
Dependent Claim
17 words
The temperature measurement device of claim 3 in which the impedance element comprises a resistor and coil.
Claim 6
Dependent Claim
20 words
The temperature measurement device of claim 4 in which the resistance value of the resistor increases at extremely low temperatures.
Claim 7
Dependent Claim
17 words
The temperature measurement device of claim 4 in which the resistor is made of germanium or carbon.
Claim 8
Dependent Claim
28 words
The temperature measurement device of claim 1 in which said second antenna means includes means for intermittently transmitting radio waves having different frequencies to said first antenna means.
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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) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |