Patent US2353537A successfully refreshed from Google Patents.
US2353537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diagnostic headset
Assignee: NAT ELECTRIC INSTR CO Inc
•
Filing: 1940-09-14
•
Granted: 1944-07-11
•
Expires: 1960-09-14
Abstract
No abstract record available.
Inventors
- 👤 Walter A Arnesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:35
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/0008
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) | 1947-07-11 | 1948-01-10 | 1948-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-07-11 | 1952-01-10 | 1952-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-07-11 | 1956-01-10 | 1956-07-11 | $7700.00 | Window Closed / Lapsed |