US3634871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensing circuit
Assignee: CGR Medical Corp
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Filing: 1970-04-15
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Granted: 1972-01-11
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Expires: 1990-04-15
Abstract
Abstract An analog voltage multiplier in combination with an operational integrator. The overall circuit measures the energy input to an X-ray generator tube and compensates for its thermal dissipation. If safe bounds are exceeded, the tube is shut down. These circuits are independent of the normal control circuits so that the tube and patient are protected.
Inventors
- 👤 Melvin P Siedband
- 👤 Jack L James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:04
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/30; H05G1/36; G; G01; G01K; G01K17/00; H02; H02H; H02H6/00; H02H6/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
Apparatus for providing a continuous approximation of heat developed in a load device, said heat being caused by current and voltage applied to said load, comprising first means including pulse generator means for providing a first signal related to the current through said load, said first signal comprising a plurality of pulses having a period inversely proportional to the amount of current flowing through said load, second means for controlling said first signal in response to the voltage which is applied to said load, means for sensing said controlled first signal for a predetermined period of time and for storing a second signal, said second signal being related to the value of said controlled first signal and the time over which it is available for storage, and means for decreasing said second signal at a predetermined rate.
Claim 2
Dependent Claim
137 words
Apparatus for providing a continuous approximation of heat developed in a load device, said heat being caused by current and voltage applied to said load, comprising first means including pulse generator means for providing a first signal related to the current through said load, said first signal comprising a plurality of pulses having a period inversely proportional to the amount of current flowing through said load, second means for controlling said first signal in response to the voltage which is applied to said load, means for sensing said controlled first signal for a predetermined period of time and for storing a second signal, said second signal being related to the value of said controlled first signal and the time over which it is available for storage, and means for decreasing said second signal at a predetermined rate.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1, wherein said second means determines the amplitude of each of said plurality of pulses.
Claim 4
Dependent Claim
43 words
The apparatus of claim 2, wherein said sensing and storing means includes an operational integrator means for providing an output signal responsive to said plurality of pulses and further includes a capacitor connected across the output and input of said operational integrator means.
Claim 5
Dependent Claim
22 words
The apparatus of claim 3, wherein said decreasing means includes resistance means operatively connected to said operational integrator means and said capacitor.
Claim 6
Dependent Claim
28 words
The apparatus of claim 4, including means connected to said operational integrator means for enabling a continuous indication of the amount of heat remaining in said load service.
References Cited (Backward Citations)
US2583095A
Cited
US2840718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |