US Patent: 25,747
|
| Improvement in methods of combining emery with caoutchouc
|
|
Patentee:
|
|
| Thomas J. Mayall (exact or similar names) - Roxbury, MA |
| Manufacturer: |
| Not known to have been produced |
|
|
Patent Dates:
|
| Granted: |
Oct. 11, 1859 |
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward
Jeff Joslin
|
|
Description: |
| Improvements to patents to the same inventor dated 1859-01-11 and 1859-05-17, which used a mixture of emery, india-rubber, sulphur and olive oil. This new recipe allows the use of a much higher proportion of emery: 15 lb emery, 1 lb rubber or gutta-percha, and 5 oz sulphur. The ingredients are combined and then placed in molds under pressure, then baked. The key innovation here seems to be the pressure. |
|
