US3778770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching system having coded push-buttons
Assignee: US Philips Corp
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Filing: 1971-10-29
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Granted: 1973-12-11
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Expires: 1991-10-29
Abstract
Abstract An elective lock in the form of a set of pushbuttons which each have an alternately closing and opening contact. The contacts are connected in parallel with one another, so that switching off the lock is possible only by pushing solely the same buttons as are pushed in locking the device.
Inventors
- 👤 J Hagendoorn
- 👤 D Schieving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:55
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/00174; G07C9/00658; G07C9/00674; G07C9/0069; G08; G08B; G08B13/00; G08B13/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A switching apparatus for selectively forming a conductive path and a non-conductive whereby an associated device may be selectively energized and disabled, comprising a plurality of bistable switching members; each member comprising a manually operated button biased to return to a single mutual position after release of manual pressure, and a bistable switch having at least two contacts alternately forming a conductive and a nonconducting path in response to manual operation of the button; and means for connecting all of the bistable switch contacts in parallel with the associated device, whereby a first manual operation of selected switching members to a stable conducting state forms a conducting path across the associated device, the conducting path being removable only by manual operation of solely those members selected during the first manual operation.
Claim 2
Dependent Claim
131 words
A switching apparatus for selectively forming a conductive path and a non-conductive whereby an associated device may be selectively energized and disabled, comprising a plurality of bistable switching members; each member comprising a manually operated button biased to return to a single mutual position after release of manual pressure, and a bistable switch having at least two contacts alternately forming a conductive and a nonconducting path in response to manual operation of the button; and means for connecting all of the bistable switch contacts in parallel with the associated device, whereby a first manual operation of selected switching members to a stable conducting state forms a conducting path across the associated device, the conducting path being removable only by manual operation of solely those members selected during the first manual operation.
Claim 3
Dependent Claim
26 words
Switching system as claimed in claim 1, characterized in that the manually operated buttons are pushbuttons which each operate a switch having two automatically alternating positions.
Claim 4
Dependent Claim
31 words
Switching system as claimed in claim 1, characterized in that the associated device it serves to switch on and switch off is a burglar alarm apparatus with a given time delay.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |