US3621671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable ice skating rink
Assignee: BEVERLY REFRIGERATION Inc
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Filing: 1969-12-15
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Granted: 1971-11-23
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Expires: 1989-12-15
Abstract
Abstract A PORTABLE ICE SKATING RINK IS PROVIDED WHICH INCLUDES FLOOR MADE UP OF A SERIES OF EXTRUDED PANEL PLACED ADJACENT ONE ANOTHER. TUBULAR PASSAGEWAYS FOR CARRYING THE HEAT TRANSFER SOLUTION ARE FORMED INTEGRALLY WITH THE EXTRUSION. APPROPRIATE HEADERS ARE PROVIDED AT EACH END OF THE PANELS SO THAT THE HEAT TRANSFER SOLUTION MAY BE CIRCULATED THROUGH THE PASSAGEWAYS IN EACH OF THE PANELS AND A FREEZING CONDITION MAY BE CREATED TO FORM ICE ON THE TOP SURFACE OF THE PANELS. INSULATION AND A BOTTOM PROTECTIVE SURFACE ARE APPLIED TO THE UNDERSIDE OF THE PANELS TO PROVIDE A COMPLETE ICE RINK SYSTEM.
Inventors
- 👤 William R Ullrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:59
CPC Classifications
E; E01; E01C; E01C13/00; E01C13/10; E01C13/102; E01C13/105
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |