US3924360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife sharpener
Assignee: Individual
•
Filing: 1973-06-08
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Granted: 1975-12-09
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Expires: 1993-06-08
Abstract
Abstract A knife sharpener for holding a knife at a predetermined angle on a whetsone in which first and second members are pivotally interconnected with corresponding first and second surfaces for gripping the knife blade. An adjustment screw is threadably coupled with the members. Each member has an outer shoulder for determining the angle at which the blade cutting edge will be maintained relative to the whetstone during sharpening.
Inventors
- 👤 Paul C Haile
- 👤 Arthur O Sellgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:48
CPC Classifications
B; B24; B24D; B24D15/00; B24D15/06; B24D15/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
A knife sharpener for holding a knife at a predetermined angle on a whetstone, comprising: first and second members hingedly attached at their central portions by pivotally connected opposed extensions on said members; first and second opposite surfaces at one end of said first and second members, said surfaces being of a dimension for carrying a knife therebetween; adjustment means at another end of said first and second members operable for adjusting the distance between said first and second surfaces; first and second shoulders on said first and second members, respectively, and extending outwardly therefrom, said first and second shoulders being dimensioned for defining a predetermined angle between a knife carried by said first and second surfaces and a whetstone; and said adjustment means comprises a single thumb wheel positioned between said first and second members that is threadably coupled to said first and second members.
Claim 2
Dependent Claim
146 words
A knife sharpener for holding a knife at a predetermined angle on a whetstone, comprising: first and second members hingedly attached at their central portions by pivotally connected opposed extensions on said members; first and second opposite surfaces at one end of said first and second members, said surfaces being of a dimension for carrying a knife therebetween; adjustment means at another end of said first and second members operable for adjusting the distance between said first and second surfaces; first and second shoulders on said first and second members, respectively, and extending outwardly therefrom, said first and second shoulders being dimensioned for defining a predetermined angle between a knife carried by said first and second surfaces and a whetstone; and said adjustment means comprises a single thumb wheel positioned between said first and second members that is threadably coupled to said first and second members.
Claim 3
Dependent Claim
26 words
The knife sharpener of claim 1 and further including: first and second neoprene pads fixedly attached to and substantially covering said first and second surfaces, respectively.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |