US3269475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transportation system having two pairs of endless tracks
Assignee: DURAMOBILE CO
•
Filing: 1963-11-19
•
Granted: 1966-08-30
•
Expires: 1983-11-19
Abstract
No abstract record available.
Inventors
- 👤 Walter D Voelker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:36
CPC Classifications
B; B62; B62D; B62D1/00; B62D1/24; B62D51/00; B62D51/007; B62D55/00; B62D55/02; B62D55/06; B62D55/062
Claims Analysis
Total Claims: 0
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US2877981A
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US2857008A
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US3156315A
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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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |