Patent US3670186A successfully refreshed from Google Patents.
US3670186A
Expired / Lapsed
US
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Piezoelectric device utilizing lithium germanate
Assignee: National Research Development Corp UK
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Filing: 1971-07-19
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Granted: 1972-06-13
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Expires: 1991-07-19
Abstract
Abstract A device using the piezoelectric effect wherein the material in which the piezoelectric effect takes place is lithium germanate, Li2GeO3.
Inventors
- 👤 Maurice Vernon Hobden
- 👤 George Joseph Rich
- 👤 Daniel Stewart Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:17
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02543
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
A device as claimed in claim 1 and in which the lithium germanate is prepared by melting together equal molecular quantities of lithium carbonate, Li2CO3 and germanium dioxide, GeO2.
Claim 2
Dependent Claim
18 words
A device as claimed in claim 1 and in which the lithium germanate is in single crystal form.
Claim 3
Dependent Claim
14 words
A device as claimed in claim 1 and constituting a crystal controlled electrical oscillator.
Claim 4
Dependent Claim
30 words
A device as claimed in claim 1 and constituting an acoustic surface wave device including a body of lithium germanate having a plane surface with acoustic surface wave elements thereon.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |