Patent EP0036463A2 successfully refreshed from Google Patents.
Patent US3168161A successfully refreshed from Google Patents.
US3168161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Littmann
Assignee: —
•
Filing: —
•
Granted: 1965-02-02
•
Expires: 1982-02-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:56
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN A STETHOSCOPE CONSTRUCTION HAVING A PAIR OF RIGID ELONGATED EAR TUBES AND A FLEXIBLE Y TUBE WITH INTEGRAL ARMS AN A STEM, A PAIR OF ELONGATED LEAF SPRINGS POSITIONED WITHIN SAID Y TUBE ARMS AND PRESTRESSED TO FORM U-SHAPED ARCS, AND MEANS INTERENGAGING EACH OF SAID LEAF SPRINGS AT THEIR ENDS TO SAID EAR TUBES WITH ONE SPRING LONGITUDINALLY SLIDABLE WITH RESPECT TO THE OTHER TO SECURE SAID EAR TUBES IN SELECTED ANGULAR RELATIONSHIP TO ONE ANOTHER.
Claim 2
Dependent Claim
78 words
IN A STETHOSCOPE CONSTRUCTION HAVING A PAIR OF RIGID ELONGATED EAR TUBES AND A FLEXIBLE Y TUBE WITH INTEGRAL ARMS AN A STEM, A PAIR OF ELONGATED LEAF SPRINGS POSITIONED WITHIN SAID Y TUBE ARMS AND PRESTRESSED TO FORM U-SHAPED ARCS, AND MEANS INTERENGAGING EACH OF SAID LEAF SPRINGS AT THEIR ENDS TO SAID EAR TUBES WITH ONE SPRING LONGITUDINALLY SLIDABLE WITH RESPECT TO THE OTHER TO SECURE SAID EAR TUBES IN SELECTED ANGULAR RELATIONSHIP TO ONE ANOTHER.
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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |