Patent US2817815A successfully refreshed from Google Patents.
US2817815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transient signal recorder
Assignee: Individual
•
Filing: 1948-02-02
•
Granted: 1957-12-24
•
Expires: 1968-02-02
Abstract
No abstract record available.
Inventors
- 👤 Thomas P Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:44
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2008563A
Cited
US1759604A
Cited
US2110172A
Cited
US1854640A
Cited
US2103481A
Cited
US1801657A
Cited
US2095124A
Cited
US1918834A
Cited
US2094645A
Cited
US2369619A
Cited
US2413440A
Cited
US2479881A
Cited
US2486890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |