US3125050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bertrand
Assignee: —
•
Filing: —
•
Granted: 1964-03-17
•
Expires: 1981-03-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:00
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN AN ELECTRIC SEWING MACHINE, THE COMBINATION OF A NEEDLE, A MOTOR CONTROLLING THE RECIPROCATION OF THE NEEDLE AND INCLUDING AN ARMATURE WINDING AND A FIELD WINDING, A SOURCE OF A.C., A SUPPLY CIRCUIT NORMALLY CONNECTING SAID SOURCE AND SAID WINDINGS IN SERIES, A RECTIFYING BRIDGE, A FIRST CIRCUIT CONNECTING SAID SOURCE WITH THE INPUT OF THE RECTIFYING BRIDGE, A SECOND, NORMALLY OPEN CIRCUIT CONNECTING THE OUTPUT OF THE RECTIFYING BRIDGE WITH THE WINDINGS IN PARALLEL RELATIONSHIP, A PRIMARY SWITCH SIMULTANEOUSLY DISCONNECTING SAID SOURCE WITH REFERENCE TO THE WINDINGS AND CLOSING THE SECOND CIRCUIT TO MAKE THE MOTOR RUN UNDER LOW VOLTAGE, LOW SPEED, HIGH TORQUE CONDITIONS AS A D.C. MOTOR FED BY THE SECOND CIRCUIT, AND MEANS MOVING SYNCHRONOUSLY WITH THE NEEDLE AND BREAKING THE FIRST CIRCUIT AT A PREDETERMINED MOMENT CORRESPONDING TO A PREDETERMINED POSITION OF THE NEEDLE.
Claim 2
Dependent Claim
140 words
IN AN ELECTRIC SEWING MACHINE, THE COMBINATION OF A NEEDLE, A MOTOR CONTROLLING THE RECIPROCATION OF THE NEEDLE AND INCLUDING AN ARMATURE WINDING AND A FIELD WINDING, A SOURCE OF A.C., A SUPPLY CIRCUIT NORMALLY CONNECTING SAID SOURCE AND SAID WINDINGS IN SERIES, A RECTIFYING BRIDGE, A FIRST CIRCUIT CONNECTING SAID SOURCE WITH THE INPUT OF THE RECTIFYING BRIDGE, A SECOND, NORMALLY OPEN CIRCUIT CONNECTING THE OUTPUT OF THE RECTIFYING BRIDGE WITH THE WINDINGS IN PARALLEL RELATIONSHIP, A PRIMARY SWITCH SIMULTANEOUSLY DISCONNECTING SAID SOURCE WITH REFERENCE TO THE WINDINGS AND CLOSING THE SECOND CIRCUIT TO MAKE THE MOTOR RUN UNDER LOW VOLTAGE, LOW SPEED, HIGH TORQUE CONDITIONS AS A D.C. MOTOR FED BY THE SECOND CIRCUIT, AND MEANS MOVING SYNCHRONOUSLY WITH THE NEEDLE AND BREAKING THE FIRST CIRCUIT AT A PREDETERMINED MOMENT CORRESPONDING TO A PREDETERMINED POSITION OF THE NEEDLE.
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) | 1967-03-17 | 1967-09-16 | 1968-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-17 | 1971-09-16 | 1972-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-17 | 1975-09-16 | 1976-03-17 | $7700.00 | Window Closed / Lapsed |