US2439906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheel springing element
Assignee: Transit Research Corp
•
Filing: 1943-03-29
•
Granted: 1948-04-20
•
Expires: 1963-03-29
Abstract
No abstract record available.
Inventors
- 👤 Emil H Piron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:51
CPC Classifications
B; B60; B60B; B60B17/00; B60B17/0027; B60B17/0031; B60B17/0034; B60B17/0041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR426697A
Cited
US1917929A
Cited
US2167633A
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US2161164A
Cited
US2290661A
Cited
US2259776A
Cited
US2335222A
Cited
US2390290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |