Patent US3870587A successfully refreshed from Google Patents.
US3870587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ice Floor
Assignee: Northrop Grumman Systems Corp
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Filing: 1973-05-14
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Granted: 1975-03-11
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Expires: 1993-05-14
Abstract
Abstract A removable cover floor for an ice rink in an auditorium, comprising individual rectangular panels each having a metal top surface, a foam plastic core, and a plywood bottom surface. Between the upper and lower surfaces, the edges of a panel have a wooden frame with lifting slots therein.
Inventors
- 👤 Franklin O Merrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:11
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; A; A63; A63C; A63C19/00; A63C19/12; B32B21/00; B32B21/04; B32B21/08; B32B2307/00; B32B2307/30; B32B2307/304; B32B2325/00; B32B2607/00; Y; Y10; Y10T; Y10T428/00; Y10T428/16; Y10T428/23; Y10T428/233
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
A removable load-bearing panel for a sub-floor over ice, comprising: a. a sheet metal top surface, b. a rigid lower surface, c. a heat-insulating core of plastic foam bonded between said surfaces, d. a wooden frame bonded between said surfaces and to the outer edges of said core, said frame having flat smooth outer sides whereby a plurality of panels can be placed contiguous to each other to form a floor, and including panel handling means provided in the outer sides of said frame, said handling means being hand holds for lifting and placement of said panel.
Claim 2
Dependent Claim
97 words
A removable load-bearing panel for a sub-floor over ice, comprising: a. a sheet metal top surface, b. a rigid lower surface, c. a heat-insulating core of plastic foam bonded between said surfaces, d. a wooden frame bonded between said surfaces and to the outer edges of said core, said frame having flat smooth outer sides whereby a plurality of panels can be placed contiguous to each other to form a floor, and including panel handling means provided in the outer sides of said frame, said handling means being hand holds for lifting and placement of said panel.
Claim 3
Dependent Claim
97 words
A removable load-bearing panel for a sub-floor over ice, comprising: a. a sheet metal top surface, b. a rigid lower surface, c. a heat-insulating core of plastic foam bonded between said surfaces, d. a wooden frame bonded between said surfaces and to the outer edges of said core, said frame having flat smooth outer sides whereby a plurality of panels can be placed contiguous to each other to form a floor, and including panel handling means provided in the outer sides of said frame, said handling means being hand holds for lifting and placement of said panel.
Claim 4
Dependent Claim
97 words
A removable load-bearing panel for a sub-floor over ice, comprising: a. a sheet metal top surface, b. a rigid lower surface, c. a heat-insulating core of plastic foam bonded between said surfaces, d. a wooden frame bonded between said surfaces and to the outer edges of said core, said frame having flat smooth outer sides whereby a plurality of panels can be placed contiguous to each other to form a floor, and including panel handling means provided in the outer sides of said frame, said handling means being hand holds for lifting and placement of said panel.
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |