US2531040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealed dowel bar and shielded bearing
Assignee: Individual
•
Filing: 1946-07-03
•
Granted: 1950-11-21
•
Expires: 1966-07-03
Abstract
No abstract record available.
Inventors
- 👤 John N Heltzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:34
CPC Classifications
E; E01; E01C; E01C11/00; E01C11/02; E01C11/04; E01C11/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2256930A
Cited
US2110738A
Cited
US2269703A
Cited
US2319713A
Cited
US2291109A
Cited
US2419022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |