US3365022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silencing means for percussive pneumatic tools
Assignee: Holman Brothers Ltd
•
Filing: 1966-12-19
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Granted: 1968-01-23
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Expires: 1986-12-19
Abstract
No abstract record available.
Inventors
- 👤 Antony D Barber
- 👤 Adamson Michael George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:28
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/11; B25D17/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PERCUSSIVE PNEUMATIC TOOL OF THE RECIPROCATING PISTON AND CYLINDER TYPE, PROVIDED WITH AN EXHAUST SILENCING MEANS COMPRISING FIRST AND SECOND EXPANSION CHAMBERS LOCATED OUTSIDE THE CYLINDER, THE CYLINDER HAVING A DISCHARGE PORT CONTROLLED BY THE PISTON AND LEADING INTO THE FIRST EXPANSION CHAMBER AND ARRANGED TO BE UNCOVERED AT A LATE STAGE IN THE WORKING STROKE OF THE PISTON TO ALLOW THE DISCHARGE OF COMPRESSED AIR FROM THE CYLINDER INTO THE FIRST EXPANSION CHAMBER, AND TRANSFER MEANS CONTROLLED BY THE PISTON FOR PLACING THE INTERIOR OF THE SECOND CHAMBER IN COMMUNICATION WITH THAT OF THE FIRST CHAMBER AT THE SAME OR A LATER STAGE IN THE WORKING STROKE OF THE PISTON TO ALLOW THE DISCHARGE OF THE PARTLY-EXPANDED COMPRESSED AIR FROM THE FIRST EXPANSION CHAMBER INTO THE SECOND EXPANSION CHAMBER, THE SECOND EXPANSION CHAMBER HAVING AN OPEN EXHAUST DISCHARGING INTO THE ATMOSPHERE.
Claim 2
Dependent Claim
143 words
A PERCUSSIVE PNEUMATIC TOOL OF THE RECIPROCATING PISTON AND CYLINDER TYPE, PROVIDED WITH AN EXHAUST SILENCING MEANS COMPRISING FIRST AND SECOND EXPANSION CHAMBERS LOCATED OUTSIDE THE CYLINDER, THE CYLINDER HAVING A DISCHARGE PORT CONTROLLED BY THE PISTON AND LEADING INTO THE FIRST EXPANSION CHAMBER AND ARRANGED TO BE UNCOVERED AT A LATE STAGE IN THE WORKING STROKE OF THE PISTON TO ALLOW THE DISCHARGE OF COMPRESSED AIR FROM THE CYLINDER INTO THE FIRST EXPANSION CHAMBER, AND TRANSFER MEANS CONTROLLED BY THE PISTON FOR PLACING THE INTERIOR OF THE SECOND CHAMBER IN COMMUNICATION WITH THAT OF THE FIRST CHAMBER AT THE SAME OR A LATER STAGE IN THE WORKING STROKE OF THE PISTON TO ALLOW THE DISCHARGE OF THE PARTLY-EXPANDED COMPRESSED AIR FROM THE FIRST EXPANSION CHAMBER INTO THE SECOND EXPANSION CHAMBER, THE SECOND EXPANSION CHAMBER HAVING AN OPEN EXHAUST DISCHARGING INTO THE ATMOSPHERE.
References Cited (Backward Citations)
US2896580A
Cited
US3332504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-22 | 1971-07-24 | 1972-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-22 | 1975-07-24 | 1976-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-22 | 1979-07-24 | 1980-01-23 | $7700.00 | Window Closed / Lapsed |