US3288398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evacuated hollow structures
Assignee: Individual
•
Filing: 1964-08-28
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Granted: 1966-11-29
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Expires: 1984-08-28
Abstract
No abstract record available.
Inventors
- 👤 Axelsson Axel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:38
CPC Classifications
B; B64; B64B; B64B1/00; B64B1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A BALLON-TYPE AERIAL VEHICLE COMPRISING A THIN-WALLED, RIGID ENVELOPE CONSISTING OF ALUMINUM OXIDE AND HAVING A GENERALLY SPHERICAL CONFIGURATION; SAID ENVELOPE BEING SUBSTANTIALLY EVACUATED OF CREATE A VACUUM THEREIN TO PROVIDE A LIFTING FORCE FOR SAID VEHICLE AND TO STRESS SAID ENVELOPE IN COMPRESSION IN ORDER TO UTILIZE THE FULL COMPRESSIVE STRENGTH OF THE ALUMINUM OXIDE TO OBTAIN A STRONG LIGHTWEIGHT ENVELOPE CAPABLE OF RESISTING COLLAPSE; AN AIR OUTLET COMMUNICATING WITH THE INTERIOR OF SAID ENVELOPE; AND MEANS FOR CONTROLLING THE PASSAGE OF AIR THROUGH SAID OUTLET TO VARY THE LIFTING FORCE OF SAID VEHICLE.
Claim 2
Dependent Claim
95 words
A BALLON-TYPE AERIAL VEHICLE COMPRISING A THIN-WALLED, RIGID ENVELOPE CONSISTING OF ALUMINUM OXIDE AND HAVING A GENERALLY SPHERICAL CONFIGURATION; SAID ENVELOPE BEING SUBSTANTIALLY EVACUATED OF CREATE A VACUUM THEREIN TO PROVIDE A LIFTING FORCE FOR SAID VEHICLE AND TO STRESS SAID ENVELOPE IN COMPRESSION IN ORDER TO UTILIZE THE FULL COMPRESSIVE STRENGTH OF THE ALUMINUM OXIDE TO OBTAIN A STRONG LIGHTWEIGHT ENVELOPE CAPABLE OF RESISTING COLLAPSE; AN AIR OUTLET COMMUNICATING WITH THE INTERIOR OF SAID ENVELOPE; AND MEANS FOR CONTROLLING THE PASSAGE OF AIR THROUGH SAID OUTLET TO VARY THE LIFTING FORCE OF SAID VEHICLE.
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |