US3872722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low drain pulse generator
Assignee: Svensk Värmemätning AB
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Filing: 1973-12-03
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Granted: 1975-03-25
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Expires: 1993-12-03
Abstract
Abstract A low drain pulse generator which can be used in, for example, apparatus for measuring temperature differences in a flowing fluid includes a pair of monostable flip-flops connected in cascade to a mechanically actuated switch which yield sequential pulses when the switch is actuated. The outputs of the monostable flip-flops are connected to inputs of a pulse generating circuit which transmits a bipolar pulse signal to its output upon receipt of the sequential pulses from the monostable flip-flops.
Inventors
- 👤 Stig Ingvar Karlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:32
CPC Classifications
G; G01; G01K; G01K17/00; G01K17/06; G01K17/08; G01K17/10; G01K17/12; G01K17/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
336 words
An apparatus for measuring the thermal properties of a flowing fluid comprising: temperature dependent elements for generating, in response to a voltage pulse applied to each of said elements; first and second electric currents which are proportional to the temperature at first and second regions of said flowing fluid; differential means for generating the difference current of the first and second electric currents which represents the temperature difference between said two regions; analog-to-digital conversion means for converting said difference current into a first pulse train with a pulse repetition rate proportional to the amplitude of said difference current; a volumeter means for measuring a predetermined volume of the flowing fluid and including a first means which is activated each time a predetermined volume has been measured; pulse generating means (K) controlled by said first means in said volumeter means for transmitting said voltage pulse to said temperature dependent elements for each volume indication; a gating means having a first input connected to said analog-todigital conversion means and a second input connected to an output of said pulse generating means;; a D.C. voltage source connected as a supply voltage to said pulse generating means; and said pulse generating means including a first and a second monostable flip-flip each of which has a trigger input and an inverting and a non-inverting output, the trigger input of said first flip-flop being connected to the output of said volumeter means and the trigger input of said second flip-flop being connected to the inverting output of said first flip-flop, the non-inverting output of said first flip-flop being connected to the second input of said gating means, a pulse generating circuit for generating a voltage pulse having a predetermined duration and having two inputs and an output, said inputs each being connected to the same outputs of each of said flip-flops, and output transformer means, connected to the output of said pulse generating circuit, for transmitting to each of said temperature dependent elements the voltage pulse generated by said pulse generating circuit.
Claim 2
Independent Claim
336 words
An apparatus for measuring the thermal properties of a flowing fluid comprising: temperature dependent elements for generating, in response to a voltage pulse applied to each of said elements; first and second electric currents which are proportional to the temperature at first and second regions of said flowing fluid; differential means for generating the difference current of the first and second electric currents which represents the temperature difference between said two regions; analog-to-digital conversion means for converting said difference current into a first pulse train with a pulse repetition rate proportional to the amplitude of said difference current; a volumeter means for measuring a predetermined volume of the flowing fluid and including a first means which is activated each time a predetermined volume has been measured; pulse generating means (K) controlled by said first means in said volumeter means for transmitting said voltage pulse to said temperature dependent elements for each volume indication; a gating means having a first input connected to said analog-todigital conversion means and a second input connected to an output of said pulse generating means;; a D.C. voltage source connected as a supply voltage to said pulse generating means; and said pulse generating means including a first and a second monostable flip-flip each of which has a trigger input and an inverting and a non-inverting output, the trigger input of said first flip-flop being connected to the output of said volumeter means and the trigger input of said second flip-flop being connected to the inverting output of said first flip-flop, the non-inverting output of said first flip-flop being connected to the second input of said gating means, a pulse generating circuit for generating a voltage pulse having a predetermined duration and having two inputs and an output, said inputs each being connected to the same outputs of each of said flip-flops, and output transformer means, connected to the output of said pulse generating circuit, for transmitting to each of said temperature dependent elements the voltage pulse generated by said pulse generating circuit.
References Cited (Backward Citations)
US3617713A
Cited
US3639737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |