US2520899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical instrument
Assignee: Productive Inventions Inc
•
Filing: 1946-04-22
•
Granted: 1950-08-29
•
Expires: 1966-04-22
Abstract
No abstract record available.
Inventors
- 👤 Theodore J Smulski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:38
CPC Classifications
G; G01; G01R; G01R5/00; G01R5/22; G01R5/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1885052A
Cited
USRE21527E
Cited
US2211773A
Cited
US2213339A
Cited
US2004421A
Cited
US2006608A
Cited
US2022441A
Cited
US2107560A
Cited
US2133077A
Cited
US2353155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |