US3496843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparing snow surface for skiing and other snow sports
Assignee: VALLEY ENGR Inc
•
Filing: 1968-04-29
•
Granted: 1970-02-24
•
Expires: 1988-04-29
Abstract
No abstract record available.
Inventors
- 👤 Otto H Wallingford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:36
CPC Classifications
E; E01; E01H; E01H4/00; E01H4/02; E01H5/00; E01H5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US639829A
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US1211811A
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US1724363A
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US1830218A
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US1895831A
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US1839000A
Cited
US2151918A
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US3119314A
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US3033295A
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US3220369A
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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) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |