US2795935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walking roof support
Assignee: Joy Manufacturing Co
•
Filing: 1952-09-30
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Granted: 1957-06-18
•
Expires: 1972-09-30
Abstract
No abstract record available.
Inventors
- 👤 Charles W Fitzgerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:30
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/08; E21D23/081; E21D23/082; E21D23/0086; E21D23/0095
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR961322A
Cited
GB150442A
Cited
US1704918A
Cited
US2647022A
Cited
US2641906A
Cited
US2623739A
Cited
US2657028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |