Patent US3229932A successfully refreshed from Google Patents.
US3229932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maneuvering valve for hot air balloon
Assignee: Raven Industries Inc
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Filing: 1964-07-09
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Granted: 1966-01-18
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Expires: 1984-07-09
Abstract
No abstract record available.
Inventors
- 👤 Paul E Yost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:03
CPC Classifications
B; B64; B64B; B64B1/00; B64B1/58; B64B1/62
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
, A BUOYANCY LIFT CONTROL FOR A BALLOON COMPRISING A BALLOON ENVELOPE OF A LIGHT WEIGHT MATERIAL, LOAD CARRYING MEANS AT THE LOWER END OF THE BALLOON, MEANS DEFINING A VERTICAL SLIT IN THE ENVELOPE MATERIAL IN THE SIDE OF THE BALLOON ENVELOPE HAVING SUBSTANTIALLY STRAIGHT SIDES WHICH ARE TOGETHER WHEN THE SLIT IS CLOSED AND SEPARATED WHEN THE SLIT IS OPENED, AND SPREADER MEANS FOR CONTROLLABLY SEPARATING SAID SLIT FOR THE ESCAPE OF GAS FROM THE BALLOON ENVELOPE.
References Cited (Backward Citations)
US1190376A
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US1866079A
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US2384416A
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US2756948A
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US2823876A
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US3096048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |