US3436922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof supports
Assignee: BODO WERNER RATZ
•
Filing: 1967-10-13
•
Granted: 1969-04-08
•
Expires: 1987-10-13
Abstract
No abstract record available.
Inventors
- 👤 Hermann Irresberger
- 👤 Hans Rieschel
- 👤 Bodo-Werner Ratz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:45
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/04; E21D23/0418; E21D23/0052
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3295331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |