US Patent: 1,350,618
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| Apparatus for making tempered blades
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Patentee:
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| Charles Napier (exact or similar names) - Springfield, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 04, 1919 |
| Granted: |
Aug. 24, 1920 |
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Jeff Joslin
Vintage Machinery entry for Napier Saw Works Inc.
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Description: |
| This patent provides improvements to the tempering process using the tempering machine of patents 1,221,576 and 1,265,944. This patent produces blades of varying temper, where the tooth tips are of maximum hardness which gradually transitions through decreasing hardness (but increasing resilience) through the rest of the tooth. |
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