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US2973178A
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Two-part metallic mine prop
Assignee: Hermann Schwarz KG
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Filing: 1957-10-24
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Granted: 1961-02-28
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Expires: 1977-10-24
Abstract
No abstract record available.
Inventors
- 👤 Heusner Wilhelm Ludwig Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:52
CPC Classifications
E; E21; E21D; E21D15/00; E21D15/14; E21D15/28; E21D15/32; E21D15/325; E21D15/58; E21D15/585; E21D15/586
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2200392A
Cited
US2461810A
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US2474464A
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FR986331A
Cited
US2691503A
Cited
GB745418A
Cited
FR1088438A
Cited
DE943825C
Cited
US2807438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |