Patent US4780704A successfully refreshed from Google Patents.
US4780704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wallet anti-theft device
Assignee: Individual
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Filing: 1987-06-15
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Granted: 1988-10-25
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Expires: 2007-06-15
Abstract
Abstract The present invention is similar to the prior art devices in that it is a two part system. One part is a small and elongated magnet which is placed in the wallet. The other part is the electronic circuitry and audio producing device in which the circuit activating switch is held open as long as the wallet with its magnet is in proximity to the second part. When the wallet and the signaling device are separated sufficiently, the magnet no longer holds the activated switch open and the switch closes thus producing the audio signal.
Inventors
- 👤 Giorgio Tommasini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:40
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/14; G08B13/149
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
A freely transportable anti-theft device for an article such as a wallet or like element comprising a magnetic field generator which is placed within and unattached to any article to be protected and an audio producing component which is placed in and unattached to a purse or clothing pocket containing the to-be-protected article, the generator acting as a trigger to activate said audio producing component when said generator is separated a pre-determined distance from said audio producing component.
Claim 2
Dependent Claim
78 words
A freely transportable anti-theft device for an article such as a wallet or like element comprising a magnetic field generator which is placed within and unattached to any article to be protected and an audio producing component which is placed in and unattached to a purse or clothing pocket containing the to-be-protected article, the generator acting as a trigger to activate said audio producing component when said generator is separated a pre-determined distance from said audio producing component.
Claim 3
Dependent Claim
31 words
The device according to claim 1 where said component includes a disabling switch to permit separation of said component and said trigger beyond said pre-determined distance without actuation of said component.
Claim 4
Dependent Claim
20 words
The device according to claim 1 wherein said magnetic field generator comprises a thin elongated magnet placed in a wallet.
Claim 5
Dependent Claim
30 words
The device according to claim 1 wherein said audio producing component comprises a battery-powered electronic circuit with a magnetically sensitive reed switch and a piezoelectric transducer generating an audio signal.
Claim 6
Dependent Claim
29 words
The device according to claim 1 wherein said audio producing component is contained in a housing which is placed in the pocket or purse in contact with said wallet.
Claim 7
Dependent Claim
62 words
The device according to claim 1 wherein said audio producing component comprises a battery-powered electronic circuit with a magnetically sensitive reed switch contained within a housing and a piezoelectric transducer generating an audio signal external to said housing and connected to said circuit by electrical conductors, said housing and transducer being placed in the pocket or purse in contact with said wallet.
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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |