US2953343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-part mine prop
Assignee: Hermann Schwarz KG
•
Filing: 1957-10-24
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Granted: 1960-09-20
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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
2026-11-04 05:07
CPC Classifications
E; E21; E21D; E21D15/00; E21D15/58; E21D15/585; E21D15/589; Y; Y10; Y10S; Y10S285/00; Y10S285/92; Y10T; Y10T403/00; Y10T403/16; Y10T403/1633; Y10T403/70; Y10T403/7075; Y10T403/7077
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |