US1913449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric oscillator
Assignee: AT&T Inc
•
Filing: 1930-02-24
•
Granted: 1933-06-13
•
Expires: 1950-02-24
Abstract
No abstract record available.
Inventors
- 👤 Kobayashi Masatsugu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:51
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/10; H03K4/12; H03K4/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-06-12 | 1936-12-12 | 1937-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-12 | 1940-12-12 | 1941-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-12 | 1944-12-12 | 1945-06-13 | $7700.00 | Window Closed / Lapsed |