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Patent US3816573A successfully refreshed from Google Patents.
US3816573A
Expired / Lapsed
US
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Laminated ski having cellular plastic core and method for producing the same
Assignee: NIPPON GUKKI SEIZO KK
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Filing: 1972-03-06
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Granted: 1974-06-11
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Expires: 1992-03-06
Abstract
Abstract A SKI CORE IS MAKE OF CELLULAR PLASTIC MATERIAL SUCH AS POLYURETHANE FOAM HAVING A SPECIFIC GRAVITY RANGING FROM 0.4 TO 0.7. FOR THE PRODUCTION OF THE CORE, A MOLE IS USED WHICH HAS A CAVITY SUBSTANTIALLY COINCIDING WITH THE CONTOUR OF THE CORE. SKI TOP AND BOTTOM PLASTES AND/OR SIDE PLATES, AS WELL AS AN H-SHAPED SPACER INTERPOSED THEREBETWEEN, MAY BE POSITIONED IN THE CAVITY BEFORE THE FOAMABLE PLASTICS, IS POURED IN THE CAVITY SO THAT THE PLATES MAY BE BONDED TO THE CORE WITHIN THE CAVITY AT THE SAME TIME WHEN THE CORE IS PRODUCED. THE H-SHAPED SPACER IS EMBEDDED IN THE CORE, SERVING AS A REINFORCEMENT FOR THE CORE.
Inventors
- 👤 O Hashimoto
- 👤 Y Takabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:37
CPC Classifications
A; A63; A63C; A63C5/00; A63C5/12; Y; Y10; Y10S; Y10S273/00; 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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |