Patent US2730398A successfully refreshed from Google Patents.
US2730398A
Expired / Lapsed
US
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Air lift devices
Assignee: Individual
•
Filing: 1951-10-24
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Granted: 1956-01-10
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Expires: 1971-10-24
Abstract
No abstract record available.
Inventors
- 👤 Richard S Huested
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:47
CPC Classifications
B; B64; B64D; B64D1/00; B64D1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US204893A
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US624078A
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US624077A
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US808161A
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US1007663A
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US1135338A
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US1181784A
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US1812955A
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US1876153A
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US2020174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |