Method for making bearing and sealing means or the like
Abstract
Abstract A method is disclosed for making an annular sealing ring utilizing a two section mold mating along noncritical surface portions of the ring and having knockout pins projecting through complementary channels to communicate with the mold cavity for ejecting the molded ring on disassembly of the mold. A thermoplastic material is injected into the mold through gate means leading to at least one of the channels. When the material has solidified, the mold is disassembled by actuating the knockout pins to eject the molded member and shear the thermoplastic material communicating with the channel through the gate means. The portion of the molded part formed by the extension of the material into the complementary channels is then broken away leaving the completed part.
Inventors
- 👤 Orville F Genz
Bibliographic Details
Claims Analysis
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |