Patent US2511979A successfully refreshed from Google Patents.
US2511979A
Expired / Lapsed
US
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Vacuum tube transportation system
Assignee: DANIEL AND FLORENCE GUGGENHEIM
•
Filing: 1945-05-21
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Granted: 1950-06-20
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Expires: 1965-05-21
Abstract
No abstract record available.
Inventors
- 👤 Esther C Goddard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:09
CPC Classifications
B; B60; B60V; B60V3/00; B60V3/02; B60V3/04; B61; B61B; B61B13/00; B61B13/12; B61B13/122; Y; Y10; Y10S; Y10S60/00; Y10S60/915
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2041607A
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US2296771A
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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) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |