Patent US4234868A successfully refreshed from Google Patents.
US4234868A
Expired / Lapsed
US
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Personal verification device
Assignee: Arkema Inc
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Filing: 1978-10-06
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Granted: 1980-11-18
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Expires: 1998-10-06
Abstract
Abstract A device for verifying personal hand markings, e.g., signatures, and optionally, voice-produced sound, by comparison of electronically produced representations thereof with similar stored information wherein such representations are produced by variations of electrical energy caused by hand markings on a surface adapted to receive said markings and comprising a poled sheet of a piezoelectric-forming resin.
Inventors
- 👤 Peter F. Radice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:22
CPC Classifications
G; G06; G06V; G06V40/00; G06V40/30; G07; G07C; G07C9/00; G07C9/30; G07C9/32; G07C9/35
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
In a verification device having a surface adapted to receive hand markings and to transmit a representation of said markings by electrical energy for comparison with a similar representation, the improvement wherein said surface comprises a poled sheet of a piezoelectric-forming resin, said poled sheet holding a sufficient charge to provide an electric response when said sheet is hand marked and being coated on each side with an electroconductive coating for transmission of electric responses generated by said hand markings.
Claim 2
Dependent Claim
80 words
In a verification device having a surface adapted to receive hand markings and to transmit a representation of said markings by electrical energy for comparison with a similar representation, the improvement wherein said surface comprises a poled sheet of a piezoelectric-forming resin, said poled sheet holding a sufficient charge to provide an electric response when said sheet is hand marked and being coated on each side with an electroconductive coating for transmission of electric responses generated by said hand markings.
Claim 3
Dependent Claim
28 words
In the verification device as described in claim 1, said piezoelectric-forming resin being a vinylidene fluoride polymer wherein said polymer is at least 65 mol percent vinylidene fluoride.
Claim 4
Dependent Claim
16 words
In the verification device as described in claim 2, said vinylidene fluoride polymer being a homopolymer.
Claim 5
Dependent Claim
35 words
In the verification device as described in claim 2, said vinylidene fluoride polymer being a copolymer of at least 65 mol percent vinylidene fluoride with at least one other copolymerizable fluorinated ethylene or propylene monomer.
Claim 6
Dependent Claim
25 words
In the verification device as described in claim 2, said poled sheet holding a sufficient charge to provide an electric response from proximate voice-produced sound.
References Cited (Backward Citations)
US3684828A
Cited
US3962679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |