Patent US3756074A successfully refreshed from Google Patents.
US3756074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously recording mechanical relaxation spectrometer
Assignee: Muanyagipari Kutato Intezet
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Filing: 1971-04-05
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Granted: 1973-09-04
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Expires: 1991-04-05
Abstract
Abstract The continuously recording mechanical relaxation spectrometer includes two bridge connected selsyn type motors operated by two a.c. voltages of different frequencies, one motor being a reference motor connected in reverse phase to the remaining driving motor. A specimen, the moduli of which are to be measured as a function of temperature or frequency, is subjected to torsional oscillation by the driving motor in a controlled temperature environment. Variations in the load on the driving motor are sensed as voltage variations across a load resistor connected to the bridge connected motor system, and these voltage variations are fed to a phase analyser which provides signals to operate one axis of an X-Y recorder. The remaining axis of the recorder is operated by signals from a temperature sensing unit positioned adjacent the specimen.
Inventors
- 👤 P Hedvig
- 👤 L Miskolczy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:17
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N3/38; G01N11/00; G01N11/10; G01N11/16; G01N2203/00; G01N2203/0014; G01N2203/0021; G01N2203/02; G01N2203/022; G01N2203/0222; G01N2203/0226; G01N33/00; G01N33/38; G01N33/386
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A continuously recording mechanical relaxation spectrometer for measuring the temperature dependence of the complex torsional modulus of plastic and rubber systems, comprising a phasesensitive selsyn-type motor having a pair of coils and a rotatable drive shaft, means for generating two a.c. voltages of different frequencies, means for applying said voltages to said coils to drive said motor and to rotate said drive shaft, means connecting said drive shaft to a specimen under test to apply torsion to said specimen upon rotation of said drive shaft, phase-sensitive output measuring means connected to said motor to provide an output signal that varies with variations in the load placed on said motor by said specimen under test, means for measuring the temperature of said specimen under test, and means for simultaneously recording said temperature and said output signal.
Claim 2
Dependent Claim
135 words
A continuously recording mechanical relaxation spectrometer for measuring the temperature dependence of the complex torsional modulus of plastic and rubber systems, comprising a phasesensitive selsyn-type motor having a pair of coils and a rotatable drive shaft, means for generating two a.c. voltages of different frequencies, means for applying said voltages to said coils to drive said motor and to rotate said drive shaft, means connecting said drive shaft to a specimen under test to apply torsion to said specimen upon rotation of said drive shaft, phase-sensitive output measuring means connected to said motor to provide an output signal that varies with variations in the load placed on said motor by said specimen under test, means for measuring the temperature of said specimen under test, and means for simultaneously recording said temperature and said output signal.
Claim 3
Dependent Claim
56 words
A spectrometer as claimed in claim 1, said recording means comprising an X-Y recorder having an X recording axis and a Y recording axis, said temperature-measuring means being connected to operate one axis of said X-Y recorder and said output-measuring means being connected so that said output signal operates the remaining axis of said X-Y recorder.
Claim 4
Dependent Claim
27 words
A spectrometer as claimed in claim 1, and heating means to heat said specimen, said heating means including temperature-programming means for varying the temperature of said specimen.
Claim 5
Dependent Claim
37 words
A spectrometer as claimed in claim 1, said phase-sensitive output-measuring means including a reference phase-sensitive selsyn-type motor in bridge connection with the first-mentioned motor, said reference motor being connected in reveRsed phase relation to said first-mentioned motor.
Claim 6
Dependent Claim
65 words
A spectrometer as claimed in claim 4, said generating means comprising first-generating means connected to provide an a.c. voltage of a first frequency to said first-mentioned and reference motors and second-generating means connected to provide a second a.c. voltage of a second frequency to said first-mentioned and reference motors, the second generating means being variable to provide different frequencies to said first-mentioned and reference motors.
Claim 7
Dependent Claim
35 words
A spectrometer as claimed in claim 5, said output-measuring means comprising a load resistor connected between said first generating means and said bridge-connected first-mentioned and reference motors, and phase-analyzer means connected to said load resistor.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |