Patent US3495415A successfully refreshed from Google Patents.
US3495415A
Expired / Lapsed
US
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Method for preparing and maintaining ice skating rinks
Assignee: Calmac Manufacturing Corp
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Filing: 1968-12-24
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Granted: 1970-02-17
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Expires: 1988-12-24
Abstract
No abstract record available.
Inventors
- 👤 Calvin D Maccracken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:03
CPC Classifications
F; F25; F25C; F25C3/00; F25C3/02; A; A63; A63C; A63C19/00; A63C19/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB421431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |