US1450329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine-roof-supporting method and apparatus
Assignee: Individual
•
Filing: 1922-09-09
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Granted: 1923-04-03
•
Expires: 1942-09-09
Abstract
No abstract record available.
Inventors
- 👤 Edmund C Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:15
CPC Classifications
E; E21; E21D; E21D23/00; E21D15/00; E21D15/14; E21D15/16; E21D15/24; E21D23/0052
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1926-04-02 | 1926-10-02 | 1927-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-04-02 | 1930-10-02 | 1931-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-04-02 | 1934-10-02 | 1935-04-03 | $7700.00 | Window Closed / Lapsed |