US2793719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking method for clamping devices of mine road walling
Assignee: Individual
•
Filing: 1952-06-03
•
Granted: 1957-05-28
•
Expires: 1972-06-03
Abstract
No abstract record available.
Inventors
- 👤 Langerbein Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:25
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/14; E21D11/18; E21D11/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL41330C
Cited
US904878A
Cited
US1708413A
Cited
DE683564C
Cited
FR924026A
Cited
FR985252A
Cited
US2713774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |