US2816728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pit props
Assignee: Individual
•
Filing: 1950-04-06
•
Granted: 1957-12-17
•
Expires: 1970-04-06
Abstract
No abstract record available.
Inventors
- 👤 Lobbe Armin Dieter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:25
CPC Classifications
E; E21; E21D; E21D15/00; E21D15/58; E21D15/002; E21D15/14; E21D15/44; E21D15/50; E21D15/51; E21D15/517; E21D15/585; E21D15/586; E21D15/60; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87917; Y10T137/87925; Y10T137/87965
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1208162A
Cited
US1544777A
Cited
DE574822C
Cited
GB453560A
Cited
US2247843A
Cited
US2474464A
Cited
GB636568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |