Patent US3831029A successfully refreshed from Google Patents.
US3831029A
Expired / Lapsed
US
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Pyroelectric device using lead germanate
Assignee: UK Secretary of State for Defence
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Filing: 1973-07-11
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Granted: 1974-08-20
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Expires: 1993-07-11
Abstract
Abstract A pyroelectric device includes as its pyroelectric material the material lead germanate, Pb5Ge3011. The device may be a single element detector, an array of single element detectors, a laser detector system, a laser heterodyne detector system or a pyroelectric camera tube. The lead germanate may be either single crystal material or polycrystalline material.
Inventors
- 👤 G Jones
- 👤 N Shaw
- 👤 A Vere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:10
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/45; H01J29/458; G; G01; G01K; G01K7/00; G01K7/003; G02; G02F; G02F2/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
15 words
A pyroelectric device as claimed in claim 1 and wherein said piece is a platelet.
Claim 2
Dependent Claim
19 words
A pyroelectric device as claimed in claim 1 and wherein said piece of lead germanate is a single crystal.
Claim 3
Dependent Claim
21 words
A pyroelectric device as claimed in claim 1 and wherein said piece of lead germanate is in a ceramic polycrystalline form.
Claim 4
Dependent Claim
36 words
A pyroelectric device as claimed in claim 1, and wherein said detector means incorporates at least one electrode electrically connected to said piece of lead germanate and a signal processing circuit electrically connected to said electrode.
Claim 5
Dependent Claim
45 words
A pyroelectric device as claimed in claim 5 and wherein said detector means includes a first electrode electrically connected to a first surface of the piece of lead germanate and a second electrode electrically connected to a second surface of said piece of lead germanate.
Claim 6
Dependent Claim
21 words
A pyroelectric device as claimed in claim 6 and wherein at least one of said electrodes in transparent to infra-red radiation.
Claim 7
Dependent Claim
29 words
A pyroelectric imaging system including a pyroelectric device as claimed in claim 7 and means for scanning an infra-red image across different parts of said piece of lead germanate.
Claim 8
Dependent Claim
19 words
A pyroelectric imaging system including a row and column matrix of pyroelectric devices each as claimed in claim 7.
Claim 9
Dependent Claim
40 words
A pyroelectric laser imaging system including a laser providing an output beam in the near infra-red region of the electromagnetic spectrum and a pyroelectric device as claimed in claim 7 arranged to detect the output beam of the said laser.
Claim 10
Dependent Claim
72 words
A pyroelectric laser heterodyne imaging system including a first laser, a second laser having a different frequency, means for mixing the output beam from said first laser with the output beam from said second laser, means for extracting from said beams when mixed a difference frequency signal corresponding to the difference in frequency between said beams and a pyroelectric detector as claimed in claim 1, arranged to detect said difference frequency signal.
Claim 11
Dependent Claim
57 words
A pyroelectric device as claimed in claim 5 and wherein said device is a pyroelectric camera tube system and includes means for scanning an electron beam across a surface of the piece of pyroelectric materIal to enable the pyroelectric charge developed on the piece to be transferred to the said signal processing circuit via the said electrode.
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |