Moulding of gramophone records
Abstract
Abstract GRAMAPHONE RECORDS ARE MOULDED BY A COMBINED INJECTION-COMPRESSION PROCESS. MOULDABLE MATERIAL IS INJECTED INTO THE MOULD PRIOR TO FINAL CLOSING OF THE MOULD THE TIP OF THE INJECTION NOZZLE EXTENDS INTO THE MOULD CAVITY AND WHEN THE FINAL CLOSING OF THE MOULD OCCUSRS, A COUNTERPIECE AND THE NOZZLE TIP CLOSE TOGETHER INTERMEDIATE THE RECORD SURFACES TO FORM THE CENTER HOLE IN THE RECORD. A POPPET VALVE IN THE CENTER REGION OF EACH MOULD PART IS OPEN PRIOR TO THE INJECTION STEP AND A RECORD LABEL IS HELD AT THE CENTER OF EACH MOULD PART BY SUCTION APPLIED TO THE VALVE OPENING. THE PRESSURE OF THE INJECTION MATERIAL IS SUFFICIENT TO CLOSE THE VALUES WHICH ARE SPRING BIASED TO THEIR OPEN POSITION.
Inventors
- 👤 Walter Leslie Rand
- 👤 John Ernest Simmons
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |