US3216510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for applying impact forces
Assignee: Coal Industry Patents Ltd
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Filing: 1962-08-20
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Granted: 1965-11-09
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Expires: 1982-08-20
Abstract
No abstract record available.
Inventors
- 👤 Briden Horace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:26
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/32; E21C27/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PERCUSSIVE MECHANISM FOR APPLYING IMPACT FORCES TO A BODY, COMPRISING A HOUSING, A HAMMER DISPOSED IN SAID HOUSING FOR MOVEMENT IN A PREDETERMINED DIRECTION TO APPLY AN IMPACT FORCE, MEANS FOR LOCKING THE HAMMER AGAINST MOVEMENT IN SAID DIRECTION, A CYLINDER IN SAID HOUSING, A FIRST PISTON SLIDABLY DISPOSED IN THE CYLINDER AND ADAPTED TO MOVE SAID HAMMER IN SAID DIRECTION, A SECOND PISTON SLIDABLY DISPOSED IN SAID CYLINDER AND SPACED FROM SAID FIRST PISTON TO DEFINE A GAS SPACE THEREBETWEEN FOR A QUANTITY OF A GAS, MEANS ADAPTED TO DISPLACE THE SECOND PISTON TOWARD SAID FIRST PISTON TO REDUCE SAID GAS SPACE AND PRESSURIZE ANY GAS IN SAID SPACE TO INCREASE ITS STORED ENERGY, AND RELEASE MEANS CONNECTED TO OPERATE SAID LOCKING MEANS TO ALLOW THE GAS TO EXPAND TO DRIVE SAID FIRST PISTON AND THE HAMMER IN SAID DIRECTION
Claim 2
Dependent Claim
142 words
A PERCUSSIVE MECHANISM FOR APPLYING IMPACT FORCES TO A BODY, COMPRISING A HOUSING, A HAMMER DISPOSED IN SAID HOUSING FOR MOVEMENT IN A PREDETERMINED DIRECTION TO APPLY AN IMPACT FORCE, MEANS FOR LOCKING THE HAMMER AGAINST MOVEMENT IN SAID DIRECTION, A CYLINDER IN SAID HOUSING, A FIRST PISTON SLIDABLY DISPOSED IN THE CYLINDER AND ADAPTED TO MOVE SAID HAMMER IN SAID DIRECTION, A SECOND PISTON SLIDABLY DISPOSED IN SAID CYLINDER AND SPACED FROM SAID FIRST PISTON TO DEFINE A GAS SPACE THEREBETWEEN FOR A QUANTITY OF A GAS, MEANS ADAPTED TO DISPLACE THE SECOND PISTON TOWARD SAID FIRST PISTON TO REDUCE SAID GAS SPACE AND PRESSURIZE ANY GAS IN SAID SPACE TO INCREASE ITS STORED ENERGY, AND RELEASE MEANS CONNECTED TO OPERATE SAID LOCKING MEANS TO ALLOW THE GAS TO EXPAND TO DRIVE SAID FIRST PISTON AND THE HAMMER IN SAID DIRECTION
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |