US2493461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and method of forming piezo-electric crystals
Assignee: HARVEY WELLS COMMUNICATIONS IN
•
Filing: 1944-05-04
•
Granted: 1950-01-03
•
Expires: 1964-05-04
Abstract
No abstract record available.
Inventors
- 👤 Charles W Macconnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:29
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/02; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1869169A
Cited
US2323569A
Cited
US2364501A
Cited
US2353171A
Cited
US2417179A
Cited
US2376219A
Cited
US2411298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |