Patent US2651380A successfully refreshed from Google Patents.
US2651380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stethoscope with means for regu
Assignee: —
•
Filing: —
•
Granted: 1953-09-08
•
Expires: 1970-09-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:31
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1543453A
Cited
US1841078A
Cited
US1994008A
Cited
US706627A
Cited
US917654A
Cited
US1157428A
Cited
US1132729A
Cited
US2036980A
Cited
US2215585A
Cited
US2541164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |