US2939019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangements for producing substantially constant currents
Assignee: International Standard Electric Corp
•
Filing: 1955-12-19
•
Granted: 1960-05-31
•
Expires: 1975-12-19
Abstract
No abstract record available.
Inventors
- 👤 Ridler Desmond Sydney
- 👤 Grimmond Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:26
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/32; G05B; G05B11/00; G05B11/01; G05B11/012; G05B11/016; G11; G11C; G11C19/00; G11C19/02; G11C19/04; H; H01; H01F; H01F38/00; H01F38/02; H01F38/023; H03; H03K; H03K3/00; H03K3/02; H03K3/45
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |