Patent US3307296A successfully refreshed from Google Patents.
US3307296A
Expired / Lapsed
US
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Abrading machines
Assignee: Abrasive Developments Ltd
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Filing: 1964-02-26
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Granted: 1967-03-07
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Expires: 1984-02-26
Abstract
No abstract record available.
Inventors
- 👤 Ashworth Stewart Ives
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:56
CPC Classifications
B; B24; B24C; B24C3/00; B24C3/02; B24C3/06; B24C3/065; B24C5/00; B24C5/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
AN ABRADING MACHINE COMPRISING DIRECTING MEANS FOR DIRECTING AIR AND ABRASIVE AGAINST A WORKPIECE, AN INPUT PIPE FOR CONVEYING AIR AND ABRASIVE TO THE DIRECTING MEANS, A SUCTION PIPE FOR CONVEYING A MIXTURE OF AIR, REUSABLE ABRASIVE, SHATTERED ABRASIVE AND DETRITUS FROM ADJACENT THE WORKPIECE, A SEPARATOR TO WHICH THE SUCTION PIPE DELIVERS SAID MIXTURE AND WHICH SEPARATES REUSABLE ABRASIVE FROM THE REMAINDER OF THE MIXTURE, AN UPPER HOPPER CONNECTED TO THE SEPARATOR TO BE FED WITH REUSABLE ABRASIVE THEREFROM, MEANS PLACING THE UPPER HOPPER IN COMMUNICATION WITH THE SUCTION PIPE, A LOWER HOPPER TO DELIVER ABRASIVE BY GRAVITY INTO THE INPUT PIPE, MEANS CONTINUOUSLY MAINTAINING THE INTERIOR OF THE LOWER HOPPER AT SUBSTANTIALLY THE SAME PRESSURE AS THAT IN THE INPUT PIPE, A MIDDLE HOPPER INTERPOSED BETWEEN THE UPPER AND LOWER HOPPERS AND COMMUNICATING WITH THEM BOTH, FIRST VALVE MEANS FOR SELECTIVELY PLACING THE MIDDLE HOPPER AT ONE OF THE PRESSURES OF THE SUCTION PIPE AND THE INPUT PIPE, CYCLING MEANS FOR OPERATING THE FIRST
Claim 2
Dependent Claim
166 words
AN ABRADING MACHINE COMPRISING DIRECTING MEANS FOR DIRECTING AIR AND ABRASIVE AGAINST A WORKPIECE, AN INPUT PIPE FOR CONVEYING AIR AND ABRASIVE TO THE DIRECTING MEANS, A SUCTION PIPE FOR CONVEYING A MIXTURE OF AIR, REUSABLE ABRASIVE, SHATTERED ABRASIVE AND DETRITUS FROM ADJACENT THE WORKPIECE, A SEPARATOR TO WHICH THE SUCTION PIPE DELIVERS SAID MIXTURE AND WHICH SEPARATES REUSABLE ABRASIVE FROM THE REMAINDER OF THE MIXTURE, AN UPPER HOPPER CONNECTED TO THE SEPARATOR TO BE FED WITH REUSABLE ABRASIVE THEREFROM, MEANS PLACING THE UPPER HOPPER IN COMMUNICATION WITH THE SUCTION PIPE, A LOWER HOPPER TO DELIVER ABRASIVE BY GRAVITY INTO THE INPUT PIPE, MEANS CONTINUOUSLY MAINTAINING THE INTERIOR OF THE LOWER HOPPER AT SUBSTANTIALLY THE SAME PRESSURE AS THAT IN THE INPUT PIPE, A MIDDLE HOPPER INTERPOSED BETWEEN THE UPPER AND LOWER HOPPERS AND COMMUNICATING WITH THEM BOTH, FIRST VALVE MEANS FOR SELECTIVELY PLACING THE MIDDLE HOPPER AT ONE OF THE PRESSURES OF THE SUCTION PIPE AND THE INPUT PIPE, CYCLING MEANS FOR OPERATING THE FIRST
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |