US3525869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic background level compensation
Assignee: National Research Development Corp UK
•
Filing: 1968-07-26
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Granted: 1970-08-25
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Expires: 1988-07-26
Abstract
No abstract record available.
Inventors
- 👤 Roland Werner Gubisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:01
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8624; G01N21/00; G01N21/17; G01N21/25; G01N21/27; G01N21/274; H; H03; H03K; H03K5/00; H03K5/01; H03K5/08; H03K5/082; G01N30/8641
Claims Analysis
Total Claims: 0
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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) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |