US3225216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus including a switch and both positive and negative feedback
Assignee: Honeywell Inc
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Filing: 1962-09-06
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Granted: 1965-12-21
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Expires: 1982-09-06
Abstract
No abstract record available.
Inventors
- 👤 John H Grabowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:37
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/04; H03K17/042; H03K17/04213
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
PULSE WIDTH MODULATED APPARATUS COMPRISING, IN COMBINATION: DIFFERENTIAL AMPLIFIER MEANS INCLUDING INPUT MEANS ADAPTED TO PROVIDE AN OUTPUT SIGNAL; MEANS FOR PROVIDING AN INPUT CONTROL SIGNAL TO SAID DIFFERENTIAL AMPLIFIER MEANS; POSITIVE FEEDBACK MEANS FOR INDUCING A REGENERATIVE ACTION IN SAID DIFFERENTIAL AMPLIFIER CONNECTED TO SUPPLY AN AMPLIFIED PORTION OF SAID INPUT SIGNAL TO SAID INPUT MEANS OF SAID DIFFERENTIAL AMPLIFIER MEANS; DELAYED NEGATIVE FEEDBACK MEANS CONNECTED TO SUPPLY AN AMPLIFIED PORTION OF SAID INPUT SIGNAL TO SAID INPUT MEANS OF SAID DIFFERENTIAL AMPLIFIER MEANS WHICH IS DELAYED IN TIME WITH RESPECT TO THE SIGNAL PROVIDED BY SAID POSITIVE FEEDBACK MEANS, THE TIME DELAY BEING A FUNCTUION OF THE DIFFERENCE IN AMPLITUDE BETWEEN THE OUTPUT AND THE INPUT SIGNALS, THE SIGNAL BEING SUPPLIED BY SAID DELAYED NEGATIVE FEEDBACK MEANS BEING ENOUGH LARGER THAN THE SIGNAL BEING SUPPLIED BY SAID POSITIVE FEEDBACK MEANS TO OVERCOME THE EFFECT OF THE INPUT SIGNAL AND THE POSITIVE FEEDBACK SIGNAL FOR A PREDETERMINED PERIOD OF TIME; AND SWITCHING MEANS CONNECTED TO RECEIVE THE OUTPUT SIGNAL FROM SAID DIFFERENTIAL AMPLIFIER MEANS.
Claim 2
Dependent Claim
175 words
PULSE WIDTH MODULATED APPARATUS COMPRISING, IN COMBINATION: DIFFERENTIAL AMPLIFIER MEANS INCLUDING INPUT MEANS ADAPTED TO PROVIDE AN OUTPUT SIGNAL; MEANS FOR PROVIDING AN INPUT CONTROL SIGNAL TO SAID DIFFERENTIAL AMPLIFIER MEANS; POSITIVE FEEDBACK MEANS FOR INDUCING A REGENERATIVE ACTION IN SAID DIFFERENTIAL AMPLIFIER CONNECTED TO SUPPLY AN AMPLIFIED PORTION OF SAID INPUT SIGNAL TO SAID INPUT MEANS OF SAID DIFFERENTIAL AMPLIFIER MEANS; DELAYED NEGATIVE FEEDBACK MEANS CONNECTED TO SUPPLY AN AMPLIFIED PORTION OF SAID INPUT SIGNAL TO SAID INPUT MEANS OF SAID DIFFERENTIAL AMPLIFIER MEANS WHICH IS DELAYED IN TIME WITH RESPECT TO THE SIGNAL PROVIDED BY SAID POSITIVE FEEDBACK MEANS, THE TIME DELAY BEING A FUNCTUION OF THE DIFFERENCE IN AMPLITUDE BETWEEN THE OUTPUT AND THE INPUT SIGNALS, THE SIGNAL BEING SUPPLIED BY SAID DELAYED NEGATIVE FEEDBACK MEANS BEING ENOUGH LARGER THAN THE SIGNAL BEING SUPPLIED BY SAID POSITIVE FEEDBACK MEANS TO OVERCOME THE EFFECT OF THE INPUT SIGNAL AND THE POSITIVE FEEDBACK SIGNAL FOR A PREDETERMINED PERIOD OF TIME; AND SWITCHING MEANS CONNECTED TO RECEIVE THE OUTPUT SIGNAL FROM SAID DIFFERENTIAL AMPLIFIER MEANS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |