Patent US3579683A successfully refreshed from Google Patents.
US3579683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Horseshoe-shaped lifebuoy and method of making the same
Assignee: Individual
•
Filing: 1969-08-15
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Granted: 1971-05-25
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Expires: 1989-08-15
Abstract
Abstract A HORSESHOE-SHAPED LIFE BUOY AND METHOD OF MAKING THE SAME IN WHICH A SUBSTANTIALLY U-SHAPED BODY MEMBER HAVING A PAIR OF SPACED ARMS IS FORMED OF POLYSTYRENE FOAM MATERIAL OR THE LIKE. ONE OR MORE CUTS ARE MADE IN THE BODY MEMBER, WHICH CUTS EXTEND ACROSS THE ENTIRE THICKNESS OF THE BODY MEMBER INWARDLY FROM THE OUTER EDGE OF THE BODY MEMBER. THE CUTS PERMIT THE ARMS TO FLEX, SHIFT AND "GIVE" ALONG THE CUTS. THE BUOY CAN ACCORDINGLY WITHSTAND SEPARATION PRESSURE EXERTED AGAINST THE ARMS WHICH WOULD NORMALLY CAUSE IT TO BREAK OR CRACK. THE BODY MEMBER MAY BE COMPRESSED FOR ADDED STRENGTH.
Inventors
- 👤 James H Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:31
CPC Classifications
B; B63; B63C; B63C9/00; B63C9/08; B63C9/082
Claims Analysis
Total Claims: 0
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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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |