US3565986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heating electroform molds
Assignee: Goodyear Tire and Rubber Co
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Filing: 1967-04-03
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Granted: 1971-02-23
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Expires: 1987-04-03
Abstract
Abstract THIS INVENTION RELATES TO A METHOD OF HEATING MOLDS FOR USE IN MOLDING THERMOPLASTIC MATERIAL WHEREBY THE HEATING AND COOLING CYCLES OF THE MOLD ARE SUCH THAT THE SMALL MICROSCOPIC CRACKS OR HOLES IN THE ELECTROFORM MOLDS DO NOT LEAK OIL INTO THE MOLDING CAVITY TO THEREBY MAR, DISCOLOR AND RUIN THE MOLDED ARTICLE. MORE SPECIFICALLY, THIS METHOD OF MOLDING FEEDS THE HEATING MEDIUM OR OIL TO THE MOLD AT A PRESSURE OF AT LEAST ATMOSPHERIC OR HIGHER AND REMOVES THE OIL FROM THE OTHER SIDE OF THE MOLD AT A PRESSURE LESS THAN ATMOSPHERIC TO OBTAIN THROUGHOUT THE MOLD ON THE HEATING MEDIUM SIDE A PRESSURE LESS THAN ATMOSPHERIC.
Inventors
- 👤 Russell D Byall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:39
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/02; B29C33/04; B29C41/00; B29C41/02; B29C41/18; B29C41/34; B29C41/46; Y; Y10; Y10S; Y10S425/00; Y10S425/06
Claims Analysis
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References 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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |