US Patent: 102,913
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| Improvement in fruit-jars
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Patentee:
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| John Landis Mason (exact or similar names) - New York, NY |
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Patent Dates:
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| Granted: |
May 10, 1870 |
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Jeff Joslin
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Description: |
| This improvement to the first "Mason jar" patent, 22,186, primarily adds a rubber gasket to the lid . See that earlier patent for more information.This improvement patent would be found invalid in a New York court because Mason had started using his improvements as early as 1858 but waited a decade before applying for the patent; the normal grace period allowed is about a year. |
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