Patent US2840828A successfully refreshed from Google Patents.
US2840828A
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US
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Means of inflating by air separated from combined air and water pressure
Assignee: Individual
•
Filing: 1957-04-09
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Granted: 1958-07-01
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Expires: 1977-04-09
Abstract
No abstract record available.
Inventors
- 👤 Furnberg Carl Wilmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:16
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/14; F04F5/24; E; E04; E04H; E04H15/00; E04H15/20; E04H4/00; E04H4/0018; E04H4/0025; E04H2015/202; E04H2015/204
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |