US3587497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thread breakage detector
Assignee: Farah Manufacturing Co Inc
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Filing: 1969-01-30
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Granted: 1971-06-28
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Expires: 1989-01-30
Abstract
Abstract A NOVEL SEWING MACHINE UPPER THREAD BREAKAGE DETECTOR HAS BEEN PROVIDED WHICH RELIABLY SIGNALS THE FAILURE BY THE SEWING MACHINE TO SEW PROPERLY BECAUSE OF THE UPPER THREAD BREAKAGE. THE THREAD BREAKAGE IS DETECTED DESPITE RELATIVELY HIGH CONTACT RESISTANCE IN THE OPERATING CIRCUIT ATTRIBUTABLE TO VARYING AMOUNTS OF CONTAMINANTS. THE CONTACTS ARE NOT USED DIRECTLY IN OPERATING A RELAY, THE HIGH RESISTANCE CONTACT IS TRANSFORMED TO OPERATE A LOW IMPEDANCE RELAY DRIVE.
Inventors
- 👤 Aubrey G Beazley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:54
CPC Classifications
D; D05; D05B; D05B51/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |