US2538434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roller and track construction
Assignee: North American Aviation Corp
•
Filing: 1946-01-03
•
Granted: 1951-01-16
•
Expires: 1966-01-03
Abstract
No abstract record available.
Inventors
- 👤 Norman F Svendsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:49
CPC Classifications
B; B64; B64C; B64C1/00; B64C1/14; B64C1/1476
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US195148A
Cited
US523801A
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US713996A
Cited
US1051426A
Cited
US1031677A
Cited
US1703622A
Cited
US1996310A
Cited
US2424245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |