Patent US3619833A successfully refreshed from Google Patents.
US3619833A
Expired / Lapsed
US
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Plastic raft
Assignee: Individual
•
Filing: 1969-05-13
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Granted: 1971-11-16
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Expires: 1989-05-13
Abstract
Abstract A LIGHTWEIGHT PLASTIC RAFT INCLUDING A TOP SUPPORT SURFACE WITH A DEPENDENT RIGID FOAM PLASTIC RING SIDE PROVIDING FLOTATION AND DEFINNINF A CENTRAL AIR CHAMBER. SLIGHTLY SPACED, SEGMENT SHAPED, RIGID CORES ARE PROVIDED FOR THE TOP JOINED BY THE FIBRE GLASS RESIN COMPOSITION WITH WHICH THE TOP IS COATED. A VALVE COMMUNICATE THE AIR CHAMBER WITH ATMOSPHERE AND PERMITS RAFT TO BE VACUUM LOCKED TO THE WATER.
Inventors
- 👤 Ervin J Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:53
CPC Classifications
B; B63; B63B; B63B35/00; B63B35/58; Y; Y10; Y10S; Y10S273/00; Y10S273/07; Y10S273/08
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |