US3139635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation hull
Assignee: Renaer Inc
•
Filing: 1962-07-05
•
Granted: 1964-07-07
•
Expires: 1982-07-05
Abstract
No abstract record available.
Inventors
- 👤 George H Daffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:12
CPC Classifications
B; B63; B63B; B63B5/00; B63B5/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
126 words
A FLOTATION HULL STRUCTURE COMPRISING AN INNER CORE OF LOW DENSITY UNICELLULAR PLASTIC FOAM HAVING A RIGID FRAME INBEDDED THEREIN, WITH PORTIONS OF THE FRAME PROJECTING OUTWARDLY FROM SAID CORE, A SHEET MATERIAL SHELL DEFINING AN UPWARDLY OPENING CAVITY RECEIVING SAID CORE, SAID PROJECTING FRAME PORTIONS SUPPORTING SAID CORE WITHIN THE CAVITY IN SPACED RELATION FROM THE SIDES AND BOTTOM OF SAID SHELL, AND BEING UNITED AT THEIR AREAS OF CONTACT TO THE SAID SHELL, AND UNICELLULAR PLASTIC FOAM OF GREATER DENSITY THAN SAID FOAM OF THE INNER CORE INTERPOSED BETWEEN SAID INNER CORE FOAM AND THE SKIN AND UNITED TO BOTH, SAID GREATER DENSITY FOAM AFFORDING A SHEATH OF RELATIVELY DENSER AND TOUGHER MATERIAL THAN THE INNER CORE FOAM BETWEEN THE LATTER AND THE SHELL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |