US2779871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differentiation circuit
Assignee: Sunoco Inc
•
Filing: 1952-10-24
•
Granted: 1957-01-29
•
Expires: 1972-10-24
Abstract
No abstract record available.
Inventors
- 👤 Omar L Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:04
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/32; G06G7/38; G06G7/40; G06G7/44; G06G7/14; G06G7/18; G06G7/184; G06G7/24; G06G7/48; G06G7/57; H; H03; H03K; H03K17/00; H03K17/51; H03K17/54; H03K5/00; H03K5/01; H03K5/02; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/30084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2412227A
Cited
US2324797A
Cited
US2567532A
Cited
US2682607A
Cited
US2640883A
Cited
US2581456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |