US3358722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse taper boring tool
Assignee: Individual
•
Filing: 1966-07-05
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Granted: 1967-12-19
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Expires: 1986-07-05
Abstract
No abstract record available.
Inventors
- 👤 Russell L Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:11
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/0018; B23B51/0045; Y; Y10; Y10T; Y10T408/00; Y10T408/34; Y10T408/352; Y10T82/00; Y10T82/12; Y10T82/125; Y10T82/128
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A BIT ASSEMBLY COMPRISING IN COMBINATION: A SHAFT; A STATIONARY BLADE AT ONE END OF SAID SHAFT TERMINATING IN A CUTTING EDGE; A PAIR OF MOVABLE BLADES PIVOTALLY MOUNTED ON SAID STATIONARY BLADE AND EACH TERMINATING IN A CUTTING EDGE; MEANS ON SAID SHAFT BIASING THE TERMINAL ENDS OF SAID MOVBLE BLADES LATERALLY AWAY FROM THE TERMINAL END OF SAID STATIONARY BLADE; SUPPORT MEANS MOUNTING SAID SHAFT FOR RECIPROCAL MOVEMENT THEREIN; AND MEANS REMOVABLY MOUNTED ON SAID SUPPORT MEANS LIMITING THE EXPANSION MOVEMENT OF SAID MOVABLE BLADES AS THE BIT ASSEMBLY IS MOVED DOWNWARDLY SO AS TO DRILL A HOLE HAVING INTERNAL DIAMETERS GREATER THAN THAT AT THE HOLE ENTRANCE.
Claim 2
Dependent Claim
110 words
A BIT ASSEMBLY COMPRISING IN COMBINATION: A SHAFT; A STATIONARY BLADE AT ONE END OF SAID SHAFT TERMINATING IN A CUTTING EDGE; A PAIR OF MOVABLE BLADES PIVOTALLY MOUNTED ON SAID STATIONARY BLADE AND EACH TERMINATING IN A CUTTING EDGE; MEANS ON SAID SHAFT BIASING THE TERMINAL ENDS OF SAID MOVBLE BLADES LATERALLY AWAY FROM THE TERMINAL END OF SAID STATIONARY BLADE; SUPPORT MEANS MOUNTING SAID SHAFT FOR RECIPROCAL MOVEMENT THEREIN; AND MEANS REMOVABLY MOUNTED ON SAID SUPPORT MEANS LIMITING THE EXPANSION MOVEMENT OF SAID MOVABLE BLADES AS THE BIT ASSEMBLY IS MOVED DOWNWARDLY SO AS TO DRILL A HOLE HAVING INTERNAL DIAMETERS GREATER THAN THAT AT THE HOLE ENTRANCE.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |