US3250979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulated power supply for electric motors
Assignee: 3M Co
•
Filing: 1959-05-13
•
Granted: 1966-05-10
•
Expires: 1979-05-13
Abstract
No abstract record available.
Inventors
- 👤 Chester C Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:05
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
AN ELECTRIC CURRENT-CONTROL CIRCUIT, COMPRISING FIRST AND SECOND TERMINALS BETWEEN WHICH THE FLOW OF ELECTRIC CURRENT IS TO BE CONTROLLED, FIRST AND SECOND TRANSISTORS
Claim 2
Dependent Claim
24 words
AN ELECTRIC CURRENT-CONTROL CIRCUIT, COMPRISING FIRST AND SECOND TERMINALS BETWEEN WHICH THE FLOW OF ELECTRIC CURRENT IS TO BE CONTROLLED, FIRST AND SECOND TRANSISTORS
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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |