Method of making a mold for reproducing parts of shoes and the like
Abstract
Abstract The method of making a master mold for reproducing parts having raised portions on its face comprising providing a master pattern of the part to be reproduced, positioning the master pattern within a mask on a supporting surface, displacing the elevated portions at the face of the master pattern into a substantially common plane, forming a rigid structure across the back of the master pattern and mask, about the peripheral edge of the mask and forwardly of the plane of the master pattern to provide a cavity at the forward side of the master pattern, removing the mask from the rigid structure, flooding the cavity with a curable liquid material having a lower dielectric constant than the thermoplastic of which the part is to be reproduced to a predetermined depth which is greater than the thickness of the projecting portion, causing the liquid material to cure and then stripping the cured material representing the mold from the rigid structure.
Inventors
- 👤 F Prahl
- 👤 R Dunlap
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |