US3558193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnelling or mining machine canopy with ventilation ducts
Assignee: Greenside Machine Co Ltd
•
Filing: 1969-02-07
•
Granted: 1971-01-26
•
Expires: 1989-02-07
Abstract
Abstract A CANOPY FOR A TUNNELING OR MINING MACHINE COMPRISES A PLURALITY OF DUCTS OR PIPES EXTENDING LONGITUDINALLY OF THE CANOPY AND ADAPTED TO TRANSPORT DUST LADED AIR FROM THE REGION IN ADVANCE OF THE MACHINE TO THE REAR OF THE MACHINE WHERE THE AIR PASSES INTO M EANS FOR FURTHER TRANSPORT AND/OR DUST COLLECTION, WITH MEANS TO DRAW THE DUST LADEN AIR ALONG THE DUCTS OR PIPES.
Inventors
- 👤 Andrew W Howarth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:37
CPC Classifications
E; E21; E21D; E21D19/00; E21D19/04; E21D9/00; E21D9/06; E21D9/08; E21D9/0875
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |