Patent US2728581A successfully refreshed from Google Patents.
US2728581A
Expired / Lapsed
US
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Aerial delivery containers
Assignee: Individual
•
Filing: 1951-04-27
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Granted: 1955-12-27
•
Expires: 1971-04-27
Abstract
No abstract record available.
Inventors
- 👤 Elmer C Goebert
- 👤 Robert J Lennon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:18
CPC Classifications
B; B64; B64D; B64D1/00; B64D1/02; B64D1/08; B64D1/14; B62; B62B; B62B1/00; B62B1/18
Claims Analysis
Total Claims: 0
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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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |