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Patent US3108652A successfully refreshed from Google Patents.
US3108652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stethoscope
Assignee: Cardiosonics Medical Instruments Corp
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Filing: 1960-06-16
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Granted: 1963-10-29
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Expires: 1980-06-16
Abstract
No abstract record available.
Inventors
- 👤 Littmann David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:11
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/02; A61B7/026
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
60 words
IN A STETHOSCOPE CONSTRUCTION HAVING A PAIR OF RIGID ELONGATED EAR TUBES AND A FLEXIBLE Y TUBE WITH INTEGRAL ARMS AND A STEM, AN ELONGATED LEAF SPRING POSITIONED WITHIN SAID Y TUBE ARMS AND PRESTRESSED TO FORM AN ARC OF 180*, HAVING MEANS RIGIDLY INTERENGAGING ENDS OF SAID EAR TUBES WITH THE ENDS OF SAID LEAF SPRING, AND A HELICAL
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |