US3129680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bobbin thread depletion detector for sewing machines
Assignee: Singer Co
•
Filing: 1962-05-23
•
Granted: 1964-04-21
•
Expires: 1982-05-23
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Doerner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:32
CPC Classifications
D; D05; D05B; D05B51/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A BOBBIN THREAD DEPLETION DETECTOR FOR SEWING MACHINES COMPRISING A BOBBIN, A MAGNETIC REED SWITCH MOUNTED ADJACENT TO SAID BOBBIN, A BIASING MAGNET MOUNTED IN FIXED RELATION TO SAID SWITCH AND PROVIDING A FLUX FIELD FOR SAID SWITCH SUFFICIENT TO HOLD IT CLOSED, IF CLOSED, BUT INSUFFICIENT TO CLOSE IT, IF OPEN, A MAGNET ROTATABLE WITH SAID BOBBIN AND NORMALLY RESTRAINED IN A FIRST PATH IN WHICH IT HAS NO OPERATIVE EFFECT ON SAID SWITCH BUT MOVABLE RESPONSIVELY TO NEAR-EXHAUSTION OF SAID BOBBIN THREAD SUPPLY TO A SECOND PATH IN WHICH IT CAUSES CLOSURE OF SAID SWITCH, AND A RESET MAGNET MOVABLE TO A POSITION ADJACENT SAID REED SWITCH AND OF SUCH POLARITY AS TO OPPOSE THE HOLDING FIELD OF THE BIASING MAGNET AND EFFECT OPENING OF SAID REED SWITCH.
Claim 2
Dependent Claim
130 words
A BOBBIN THREAD DEPLETION DETECTOR FOR SEWING MACHINES COMPRISING A BOBBIN, A MAGNETIC REED SWITCH MOUNTED ADJACENT TO SAID BOBBIN, A BIASING MAGNET MOUNTED IN FIXED RELATION TO SAID SWITCH AND PROVIDING A FLUX FIELD FOR SAID SWITCH SUFFICIENT TO HOLD IT CLOSED, IF CLOSED, BUT INSUFFICIENT TO CLOSE IT, IF OPEN, A MAGNET ROTATABLE WITH SAID BOBBIN AND NORMALLY RESTRAINED IN A FIRST PATH IN WHICH IT HAS NO OPERATIVE EFFECT ON SAID SWITCH BUT MOVABLE RESPONSIVELY TO NEAR-EXHAUSTION OF SAID BOBBIN THREAD SUPPLY TO A SECOND PATH IN WHICH IT CAUSES CLOSURE OF SAID SWITCH, AND A RESET MAGNET MOVABLE TO A POSITION ADJACENT SAID REED SWITCH AND OF SUCH POLARITY AS TO OPPOSE THE HOLDING FIELD OF THE BIASING MAGNET AND EFFECT OPENING OF SAID REED SWITCH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |