US3269466A
Expired / Lapsed
US
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Assignee: Porter Cable Corp
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Filing: 1964-07-17
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Granted: 1966-08-30
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Expires: 1984-07-17
Abstract
No abstract record available.
Inventors
- 👤 Walter G Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:19
CPC Classifications
B; B25; B25D; B25D11/00; B25D11/005; B25D11/06; B25D11/12; B25D11/125; B25D16/00; B25D2211/00; B25D2211/003; B25D2211/06; B25D2211/068
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IN A POWER DRIVEN HAMMER DRILL OR THE LIKE: (A) A ROTATABLY MOUNTED ANVIL; (B) MEANS FOR IMPARTING SUCCESSIVE AND REPEATED AXIAL HAMMER BLOWS TO A TOOL BIT MOUNTED IN SAID ANVIL; (C) MEANS FOR CONTINUOUSLY ROTATING SAID ANVIL WHEN ROTATION RESTRAINING TORQUE EXERTED ON SAID ANVIL IS BELOW A PREDETERMINED MAGNITUDE; AND (D) MEANS FOR IMPARTING ROTARY HAMMER BLOWS TO SAID ANVIL WHEN SAID RESTRAINING TORQUE EXERTED ON SAID ANVIL EXCEEDS SAID PREDETERMINED MAGNITUDE.
Claim 2
Dependent Claim
75 words
IN A POWER DRIVEN HAMMER DRILL OR THE LIKE: (A) A ROTATABLY MOUNTED ANVIL; (B) MEANS FOR IMPARTING SUCCESSIVE AND REPEATED AXIAL HAMMER BLOWS TO A TOOL BIT MOUNTED IN SAID ANVIL; (C) MEANS FOR CONTINUOUSLY ROTATING SAID ANVIL WHEN ROTATION RESTRAINING TORQUE EXERTED ON SAID ANVIL IS BELOW A PREDETERMINED MAGNITUDE; AND (D) MEANS FOR IMPARTING ROTARY HAMMER BLOWS TO SAID ANVIL WHEN SAID RESTRAINING TORQUE EXERTED ON SAID ANVIL EXCEEDS SAID PREDETERMINED MAGNITUDE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |