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US3872318A
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Pyroelectric element of polymer film
Assignee: Kureha Corp
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Filing: 1973-10-30
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Granted: 1975-03-18
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Expires: 1993-10-30
Abstract
Abstract A pyroelectric element comprising a polymer film which can be converted into pyroelectric substance, the polymer film having a pyroelectric distribution along its surface. The process of producing such a film comprising: POLING DESIRED LOCAL PORTIONS OF THE FILM WHILE VARYING EITHER THE TEMPERATURE AND/OR THE ELECTRIC POTENTIAL OF LOCALIZED AREAS OF THE FILM; A FURTHER PROCESS OF PRODUCING SUCH A PYROELECTRIC ELEMENT WHEREIN A DEFINITE PYROELECTRICITY IS PROVIDED TO THE SURFACE OF THE POLYMER FILM AND THEN A NON-UNIFORM DISTRIBUTION OF PYROELECTRICITY IS PROVIDED BY LOCALLY REDUCING OR ELIMINATING THE PYROELECTRICITY; A PROCESS OF STORING AND REPRODUCING SIGNALS IN SUCH A PYROELECTRIC ELEMENT COMPRISING: STORING POLARIZATION SIGNALS OF DIFFERENT PYROELECTRICITIES IN DIFFERENT PORTIONS OF SUCH AN ELEMENT, AND THEN DELIVERING THE SIGNALS AS A POLARIZATION CHANGE DUE TO A TEMPERATURE CHANGE.
Inventors
- 👤 Naohiro Murayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:11
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/0002; G11C13/0009; G11C13/0014; G11C13/0016; B; B41; B41M; B41M5/00; B41M5/26; B41M5/36; B82; B82Y; B82Y10/00; G01; G01J; G01J5/00; G01J5/10; G01J5/34; G01K; G01K7/00; G01K7/003; G03; G03G; G03G15/00; G03G15/056; G11B; G11B11/00; G11B9/00; G11B9/02; G11C11/00; G11C11/21; G11C11/22; G11C13/02; G11C13/04; G11C13/047; G11C17/00; G11C17/005; H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; H10; H10N; H10N15/00; H10N15/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A PROCESS OF STORING SIGNALS IN A PYROELECTRIC ELEMENT COMPRISING A POLYMER FILM, WHICH CAN BE CONVERED INTO A PYROELECTRIC SUBSTANCE, HAVING A STABLE NON-UNIFORM DISTRIBUTION OF PYROELECTRIC ALONG THE SURFACE OF SAID POLYMER FILM AND REPRODUCING SAID SIGNALS STORED IN THE ELEMENT, WHICH COMPRISES GENERATING STABLE POLARIZATION SIGNALS OF DIFFERENT PYROELECTRICITIES IN DIFFERENT LOCAL PORTIONS OF THE PYROELECTRIC ELEMENT AND THEN DELIVERING THE POLARIZATION SIGNALS THUS STORED FROM THE PYROELECTRIC ELEMENT AS A CONSEQUENCE OF THE POLARIZATION CHANGE CAUSED BY A TEMPERATURE CHANGE WITHOUT ELIMINATING THE STORED SIGNALS.
Claim 2
Dependent Claim
89 words
A PROCESS OF STORING SIGNALS IN A PYROELECTRIC ELEMENT COMPRISING A POLYMER FILM, WHICH CAN BE CONVERED INTO A PYROELECTRIC SUBSTANCE, HAVING A STABLE NON-UNIFORM DISTRIBUTION OF PYROELECTRIC ALONG THE SURFACE OF SAID POLYMER FILM AND REPRODUCING SAID SIGNALS STORED IN THE ELEMENT, WHICH COMPRISES GENERATING STABLE POLARIZATION SIGNALS OF DIFFERENT PYROELECTRICITIES IN DIFFERENT LOCAL PORTIONS OF THE PYROELECTRIC ELEMENT AND THEN DELIVERING THE POLARIZATION SIGNALS THUS STORED FROM THE PYROELECTRIC ELEMENT AS A CONSEQUENCE OF THE POLARIZATION CHANGE CAUSED BY A TEMPERATURE CHANGE WITHOUT ELIMINATING THE STORED SIGNALS.
Claim 3
Dependent Claim
45 words
The process of claim 1, wherein said polymer is selected from the group consisting of homopolymers of vinylidene fluoride, vinyl fluoride and vinyl chloride; copolymers thereof with monomers copolymerizable therewith; mixtures of said homopolymers and said copolymers; and mixtures of said copolymers with other polymers.
Claim 4
Dependent Claim
16 words
The process of claim 1, wherein said polymer is a homopolymer or copolymer of vinylidene fluoride.
Claim 5
Dependent Claim
34 words
The process as claimed in claim 2, wherein said polymer is a member selected from the group consisting of homopolymers of vinylidene fluoride, copolymers thereof with monomers copolymerizable therewith, polyvinyl chloride and polyvinyl fluoride.
Claim 6
Dependent Claim
33 words
The process as claimed in claim 3, wherein said copolymer is a copolymer of vinylidene fluoride with a monomer copolymerizable therewith selected from the group consisting of vinyl fluoride, trifluoroethylene, chlorotrifluoroethylene and tetrafluoroethylene.
Claim 7
Dependent Claim
16 words
The process as claimed in claim 3, wherein said copolymer contains more than 70% vinylidene fluoride.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |