US4716305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching device having a feedback means for rendering a control circuit inoperative in response to a current supply circuit being inoperative
Assignee: Canon Inc
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Filing: 1986-02-27
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Granted: 1987-12-29
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Expires: 2006-02-27
Abstract
Abstract A switching device includes a current supply circuit, a control circuit, and means for feedback from the current supply circuit to the control circuit. The current supply circuit supplies current to a load. The control circuit controls operating and non-operating of the current supply circuit. When the current supply circuit is inoperative, means for feedback renders the control circuit inoperative.
Inventors
- 👤 Takamasa Sakuragi
- 👤 Ikuo Fushimi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:27
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A switching device comprising: a current supply circuit for supplying a current to a load having operating and non-operating states; a control circuit for controlling said operating and non-operating states of said current supply circuit; and feedback means connected between said current supply circuit and said control circuit for rendering said control circuit inoperative in response to said current supply circuit being inoperative.
Claim 2
Dependent Claim
63 words
A switching device comprising: a current supply circuit for supplying a current to a load having operating and non-operating states; a control circuit for controlling said operating and non-operating states of said current supply circuit; and feedback means connected between said current supply circuit and said control circuit for rendering said control circuit inoperative in response to said current supply circuit being inoperative.
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) | 1990-12-28 | 1991-06-29 | 1991-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-28 | 1995-06-29 | 1995-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-28 | 1999-06-29 | 1999-12-29 | $7700.00 | Window Closed / Lapsed |