Patent US2778926A successfully refreshed from Google Patents.
US3852650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo apparatus for marine autopilot
Assignee: Tokyo Keiki Inc
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Filing: 1973-05-23
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Granted: 1974-12-03
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Expires: 1993-05-23
Abstract
Abstract A servo apparatus for a marine autopilot having a servo loop consisting of a servo-amplifier, a relay-like operation device, a power unit, a transducer and a feedback circuit. The feedback circuit includes a first series circuit consisting of a resistor and a variable resistor and a second series circuit consisting of a resistor and a capacitor for stabilization so that stabilization effect on the servo loop by the second series circuit is varied by changing the resistance value of the variable resistor.
Inventors
- 👤 I Masuzawa
- 👤 T Awano
- 👤 K Onishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:12
CPC Classifications
B; B63; B63H; B63H25/00; B63H25/06; B63H25/08; B63H25/14; B63H25/18; B63H25/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A servo apparatus for a marine autopilot comprising a servo loop consisting of a servo-amplifier, a relay-like operation device, a power unit, a transducer and a feedback circuit including a first resistor and a series circuit of a second resistor and a first capacitor connected in parallel to said first resistor for stabilization, and a third variable resistor connected in series with tHe parallel circuit of the first resistor and the series circuit whereby stabilizing effects on said servo loop by said series circuit is varied by changing the resistance value of said third variable resistor.
Claim 2
Dependent Claim
96 words
A servo apparatus for a marine autopilot comprising a servo loop consisting of a servo-amplifier, a relay-like operation device, a power unit, a transducer and a feedback circuit including a first resistor and a series circuit of a second resistor and a first capacitor connected in parallel to said first resistor for stabilization, and a third variable resistor connected in series with tHe parallel circuit of the first resistor and the series circuit whereby stabilizing effects on said servo loop by said series circuit is varied by changing the resistance value of said third variable resistor.
Claim 3
Dependent Claim
30 words
A servo apparatus for a marine autopilot according to claim 1 in which said feedback circuit further includes a second series circuit of a fourth resistor and a second capacitor.
Claim 4
Dependent Claim
34 words
A servo apparatus for a marine autopilot according to claim 2 in which said second series circuit is connected in parallel to the series circuit of the first resistor and the third variable resistor.
Claim 5
Dependent Claim
34 words
A servo apparatus for a marine autopilot according to claim 1 in which a third series circuit of a fifth resistor and a third capacitor are connected in parallel to said third variable resistor.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |