Process for making the stops of a slide fastener
Abstract
Abstract The invention provides a process for making the stops at the ends of the rows of interlocking units in a slide fastener by moulding these stops from thermoplastic material directly on to the ends of the rows of the interlocking units, the operation being performed by positioning the corresponding row of interlocking units between two complementary parts forming a stamp and a block and by also placing between these two parts a fragment of thermoplastic material obtained by cutting it from the end of a continuous strip of such material which is moved forward in jerks, the fragment being moulded by subjecting it to the effect of heat for example by transmitting ultrasonic vibrations to it while it is held between the two parts which form the stamp and the block and, after joining, leave between them a die cavity in the shape of the stop which is to be made.
Inventors
- 👤 M Potin
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 |
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| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |