Patent US3587194A successfully refreshed from Google Patents.
US3587194A
Expired / Lapsed
US
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Tap cutter
Assignee: CHAMPION CORP
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Filing: 1968-08-02
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Granted: 1971-06-28
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Expires: 1988-08-02
Abstract
Abstract A TAP CUTTER COMPRISING A FRAME OR HOUSING WITH INFLATABLE SLEEVES AROUND THE HOUSING WHICH ARE EXPANDED BY PNEUMATIC PRESSURE TO LOCK IT IN PLACE FRICTIONALLY IN A SELECTED POSITION WITHIN A SEWER, DRAINAGE LINE, OR THE LIKE, A ROTATING CUTTER DRIVEN BY A PNEUMATIC MOTOR AND A PISTON FOR MOVING THE CUTTER AXIALLY OF THE PIPE THROUGH A PREDETERMINED STROKE. THE EXPANSIBLE LOCKING MEANS, THE PNEUMATIC MOTOR AND THE PISTON ARE CONNECTED BY DUCTS FROM A SOURCE OF PRESSURE FLUID. A SIGNAL DEVICE MAY BE PROVIDED TO INDICATE WHEN THE STROKE OF THE PISTON IS COMPLETED. D R A W I N G
Inventors
- 👤 Jerry C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:02
CPC Classifications
B; B24; B24B; B24B5/00; B24B5/36; B24B5/40
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |