US3434389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic sequence cycle controlled advanceable mining prop arrangement
Assignee: Gewerkschaft Eisenhutte Westfalia GmbH
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Filing: 1967-09-29
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Granted: 1969-03-25
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Expires: 1987-09-29
Abstract
No abstract record available.
Inventors
- 👤 Hans-Theodor Grisebach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:10
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/16; E21D23/18; E21D23/12; E21D23/14; E21D23/148; H; H01; H01H; H01H43/00; H01H43/10; H01H43/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3207041A
Cited
US3285015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |