Patent US4661805A successfully refreshed from Google Patents.
US4661805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for indicating the movement and/or position of a shutoff means
Assignee: Individual
•
Filing: 1986-09-15
•
Granted: 1987-04-28
•
Expires: 2006-09-15
Abstract
Abstract A tamper resistant device is disclosed for dependably indicating when a door or other shut off means has reached a closed position. The device includes a series of transmitting and receiving elements brought into juxtaposition during or at the final closing movements of the door. The device may include read out means responsive to the sequence of activation of the receiving elements and/or the identity of the receiving elements activated.
Inventors
- 👤 Heinrich Salzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:53
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A tamper proof device for indicating the movement and position of a closure member relative to a frame member adapted to surround said closure member in the shut position of said closure member comprising a plurality of signal transmitters on one said member, a plurality of signal receivers on the other said member, at least a plurality of said transmitters and receivers being in registry in said shut position, said transmitters being positioned relative to said receivers such that certain said receivers are activated by certain said transmitters in a predetermined sequence responsive to movement of said closure member to and from said shut position and readout means operatively connected to said receivers, said readout means being responsive to the sequence in which signals from said transmitters are impressed on said receivers.
Claim 2
Dependent Claim
132 words
A tamper proof device for indicating the movement and position of a closure member relative to a frame member adapted to surround said closure member in the shut position of said closure member comprising a plurality of signal transmitters on one said member, a plurality of signal receivers on the other said member, at least a plurality of said transmitters and receivers being in registry in said shut position, said transmitters being positioned relative to said receivers such that certain said receivers are activated by certain said transmitters in a predetermined sequence responsive to movement of said closure member to and from said shut position and readout means operatively connected to said receivers, said readout means being responsive to the sequence in which signals from said transmitters are impressed on said receivers.
Claim 3
Dependent Claim
46 words
Apparatus in accordance with claim 1 wherein at least certain of said receivers are out of registry with certain of said transmitters in the shut position of said closure member, and said readout means is responsive to signals generated in said certain ones of said receivers.
Claim 4
Dependent Claim
19 words
Apparatus in accordance with claim 1 wherein said transmitters and said receivers comprise respectively magnets and magnetically responsive means.
Claim 5
Dependent Claim
18 words
Apparatus in accordance with claim 1 wherein said transmitters comprise radiation emitters and said receivers comprise radiation sensors.
References Cited (Backward Citations)
US3771153A
Cited
US3828340A
Cited
US4074246A
Cited
US4170005A
Cited
US4379289A
Cited
US4583082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |