US2677535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof support beam with wall drilling end
Assignee: Individual
•
Filing: 1950-02-17
•
Granted: 1954-05-04
•
Expires: 1970-02-17
Abstract
No abstract record available.
Inventors
- 👤 Paul V Malloy
- 👤 Paul J Malloy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:01
CPC Classifications
E; E21; E21D; E21D15/00; E21D15/60; E21D15/606; E21D15/603; E21D17/00; E21D17/01
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USRE18491E
Cited
US1052359A
Cited
AT83575B
Cited
US1295320A
Cited
US1588987A
Cited
DE512214C
Cited
US1840339A
Cited
GB379975A
Cited
US2090355A
Cited
US2198163A
Cited
US2496694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-03 | 1957-11-02 | 1958-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-03 | 1961-11-02 | 1962-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-03 | 1965-11-02 | 1966-05-04 | $7700.00 | Window Closed / Lapsed |