US Patent: 1,352,140
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| Tempered blade
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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: |
Dec. 09, 1918 |
| Granted: |
Sep. 07, 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 patent 1,221,576 and the process of patent 1,265,944. This patent covers sawblade composition to support his variable-tempering process which produced "glass-hard" tooth tips that became progressively softer and more resilient from the tip to the root of the tooth. |
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