US3221189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic ruggedized low frequency crystal unit
Assignee: Dynamics Corp of America
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Filing: 1963-06-03
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Granted: 1965-11-30
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Expires: 1983-06-03
Abstract
No abstract record available.
Inventors
- 👤 Franklin R Brandt
- 👤 Glas Andre J De
- 👤 Charles W Mann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:58
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/10; H03H9/1007; H03H9/1014; H03H9/0504; H03H9/0533
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A LOW FREQUENCY PIEZOELECTRIC UNIT COMPRISING A BASE, A PLURALITY OF SUPPORT MEMBERS EXTENDING UPWARDLY FROM SAID BASE, AT LEAST ONE CERAMIC SPACER HAVING A SLOT SUBSTANTIALLY CENTRALLY THERETHROUGH, A PLURALITY OF APERTURES EQUAL IN NUMBER TO SAID SUPPORT MEMBERS, AND SPACED CIRCUMFERENTIALLY NEAR THE OUTER EDGE OF SAID CERAMIC SPACER, SAID SUPPORT MEMBERS EXTENDING THROUGH SAID APERTURES, AN ELECTRICALLY CONDUCTIVE COATING ON SAID CERAMIC SPACER EXTENDING FROM AT LEAST ONE OF SAID APERTURES TO THE EDGE OF SAID SLOT, A PIEZOELECTRIC CRYSTAL UNIT EXTENDING THROUGH SAID SLOT, CONDUCTIVE LEADS CONNECTED BETWEEN THE NODAL POINTS OF SAID CRYSTAL UNIT AND SAID ELECTRICALLY CONDUCTIVE COATING, AND A SEALED HOUSING ENCLOSING SAID UNIT.
Claim 2
Dependent Claim
111 words
A LOW FREQUENCY PIEZOELECTRIC UNIT COMPRISING A BASE, A PLURALITY OF SUPPORT MEMBERS EXTENDING UPWARDLY FROM SAID BASE, AT LEAST ONE CERAMIC SPACER HAVING A SLOT SUBSTANTIALLY CENTRALLY THERETHROUGH, A PLURALITY OF APERTURES EQUAL IN NUMBER TO SAID SUPPORT MEMBERS, AND SPACED CIRCUMFERENTIALLY NEAR THE OUTER EDGE OF SAID CERAMIC SPACER, SAID SUPPORT MEMBERS EXTENDING THROUGH SAID APERTURES, AN ELECTRICALLY CONDUCTIVE COATING ON SAID CERAMIC SPACER EXTENDING FROM AT LEAST ONE OF SAID APERTURES TO THE EDGE OF SAID SLOT, A PIEZOELECTRIC CRYSTAL UNIT EXTENDING THROUGH SAID SLOT, CONDUCTIVE LEADS CONNECTED BETWEEN THE NODAL POINTS OF SAID CRYSTAL UNIT AND SAID ELECTRICALLY CONDUCTIVE COATING, AND A SEALED HOUSING ENCLOSING SAID UNIT.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |