Patent US2523339A successfully refreshed from Google Patents.
US2523339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave form demonstrator
Assignee: Individual
•
Filing: 1946-05-07
•
Granted: 1950-09-26
•
Expires: 1966-05-07
Abstract
No abstract record available.
Inventors
- 👤 Noah E Sprecher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:56
CPC Classifications
G; G09; G09B; G09B23/00; G09B23/06; G09B23/18; G09B23/183
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB214025A
Cited
US1889438A
Cited
GB518731A
Cited
US2208503A
Cited
US2203594A
Cited
US2236217A
Cited
US2376586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-25 | 1954-03-27 | 1954-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-25 | 1958-03-27 | 1958-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-25 | 1962-03-27 | 1962-09-26 | $7700.00 | Window Closed / Lapsed |