US3662355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface wave signal storage device
Assignee: International Business Machines Corp
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Filing: 1970-06-03
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Granted: 1972-05-09
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Expires: 1990-06-03
Abstract
Abstract Surface acoustic waves are propagated along piezoelectric material, in response to an electrical signal applied to an input transducer. During propagation along the material, the propagation surface of the piezoelectric material is flooded with a short burst of electrons, causing the emission of low energy secondary electrons. These electrons are immediately attracted from the negative to the more positive adjacent regions of the surface, neutralizing any potential variations on the surface. After the acoustic waves thereon have subsided, electrons trapped on the surface are left behind in a frozen pattern corresponding to the pattern of the acoustic waves. The acoustic waves can be reformed by again flooding the surface with a short burst of electrons. Output transducer means act to transform the reformed waves into an electrical signal.
Inventors
- 👤 Benjamin Kazan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:44
CPC Classifications
G; G11; G11C; G11C8/00; G11C8/005; G11C27/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
74 words
A storage device comprising a material having a piezoelectric surface, means for launching an acoustic wave along said surface so as to produce electric fields on said surface corresponding to localized variations of said wave, means for flooding said surface with electrons during the presence of said acoustic wave so as to produce a static potential pattern along said surface corresponding to said launched wave, and output means for removing said static potential pattern.
Claim 2
Dependent Claim
74 words
A storage device comprising a material having a piezoelectric surface, means for launching an acoustic wave along said surface so as to produce electric fields on said surface corresponding to localized variations of said wave, means for flooding said surface with electrons during the presence of said acoustic wave so as to produce a static potential pattern along said surface corresponding to said launched wave, and output means for removing said static potential pattern.
Claim 3
Dependent Claim
13 words
The storage device in claim 1 wherein said piezoelectric surface is also insulating.
Claim 4
Dependent Claim
125 words
A storage device comprising a material having a piezoelectric surface, means for launching a surface acoustic wave having a given period along said surface so as to produce electric fields on said surface corresponding to localized variations of said wave, means for flooding said surface with electrons during the presence of said acoustic wave so as to produce a static potential pattern along said surface corresponding to said launched wave, said electron flooding taking place for a period that is a fraction of the period of said acoustic wave, and means for sensing an output acoustic wave corresponding to said static potential pattern, said output acoustic wave being a reconstitution of the initially launched surface acoustic wave and producible by flooding said surface with electrons.
Claim 5
Dependent Claim
125 words
A storage device comprising a material having a piezoelectric surface, means for launching a surface acoustic wave having a given period along said surface so as to produce electric fields on said surface corresponding to localized variations of said wave, means for flooding said surface with electrons during the presence of said acoustic wave so as to produce a static potential pattern along said surface corresponding to said launched wave, said electron flooding taking place for a period that is a fraction of the period of said acoustic wave, and means for sensing an output acoustic wave corresponding to said static potential pattern, said output acoustic wave being a reconstitution of the initially launched surface acoustic wave and producible by flooding said surface with electrons.
Claim 6
Dependent Claim
22 words
The storage device of claim 3 wherein said electron flooding period is one-tenth or less than the period of said acoustic wave.
Claim 7
Dependent Claim
12 words
The storage device of claim 3 wherein said piezoelectric surface is quartz.
Claim 8
Dependent Claim
108 words
A storage device comprising a material having a piezoelectric surface, input transducer means arranged to transform an electrical input signal into an acoustic wave which propagates along said surface so as to produce electric fields on said surface corresponding to localized variations of said wave, means for momentarily flooding said surface with electrons during the presence of said acoustic wave so as to produce a static potential pattern along said surface corresponding to said launched wave, and output transducer means arranged to transform a reformed acoustic wave corresponding to said pattern into an electrical output signal, said reformed acoustic wave being produced by flooding said surface with electrons.
Claim 9
Dependent Claim
108 words
A storage device comprising a material having a piezoelectric surface, input transducer means arranged to transform an electrical input signal into an acoustic wave which propagates along said surface so as to produce electric fields on said surface corresponding to localized variations of said wave, means for momentarily flooding said surface with electrons during the presence of said acoustic wave so as to produce a static potential pattern along said surface corresponding to said launched wave, and output transducer means arranged to transform a reformed acoustic wave corresponding to said pattern into an electrical output signal, said reformed acoustic wave being produced by flooding said surface with electrons.
Claim 10
Dependent Claim
64 words
A storage device comprising a material having a piezoelectric surface, means for launching an acoustic wave on said surface and means for detecting said launched wave, a cathode for momentarily flooding said surface with electrons, a grid interposed between said cathode and said piezoelectric surface, and means for supplying either a negative or a positive potential to said cathode with respect to said grid.
Claim 11
Dependent Claim
64 words
A storage device comprising a material having a piezoelectric surface, means for launching an acoustic wave on said surface and means for detecting said launched wave, a cathode for momentarily flooding said surface with electrons, a grid interposed between said cathode and said piezoelectric surface, and means for supplying either a negative or a positive potential to said cathode with respect to said grid.
Claim 12
Independent Claim
101 words
A device comprising a material having an insulating piezoelectric surface which surface has been set at a uniform potential, means for launching an acoustic wave on said surface, means for momentarily flooding said surface with electrons during the presence of said acoustic wave so as to produce a static potential pattern along said surface corresponding to said launched wave, and output means to sense an output acoustic wave corresponding to said static potential pattern along said surface, said output acoustic wave being a reconsitution of the initial acoustic wave and producible by flooding with electrons said surface with static potential pattern.
Claim 13
Independent Claim
101 words
A device comprising a material having an insulating piezoelectric surface which surface has been set at a uniform potential, means for launching an acoustic wave on said surface, means for momentarily flooding said surface with electrons during the presence of said acoustic wave so as to produce a static potential pattern along said surface corresponding to said launched wave, and output means to sense an output acoustic wave corresponding to said static potential pattern along said surface, said output acoustic wave being a reconsitution of the initial acoustic wave and producible by flooding with electrons said surface with static potential pattern.
Claim 14
Dependent Claim
46 words
In a device containing a piezoelectric insulating surface on which a charge pattern has been established, means for flooding said surface with electrons to generate an acoustic surface wave corresponding to the charge pattern, and means for sensing time-varying signals produced by said acoustic surface wave.
Claim 15
Dependent Claim
46 words
In a device containing a piezoelectric insulating surface on which a charge pattern has been established, means for flooding said surface with electrons to generate an acoustic surface wave corresponding to the charge pattern, and means for sensing time-varying signals produced by said acoustic surface wave.
References Cited (Backward Citations)
US3425002A
Cited
US3325748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |