US2436807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical follow-up system
Assignee: Unisys Corp
•
Filing: 1939-12-09
•
Granted: 1948-03-02
•
Expires: 1959-12-09
Abstract
No abstract record available.
Inventors
- 👤 Eric J Isbister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:56
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/121; G05D3/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1576195A
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US1999645A
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US2060142A
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US2025158A
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US2040014A
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US2164383A
Cited
US2136606A
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US2165764A
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US2191315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-02 | 1951-09-01 | 1952-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-02 | 1955-09-01 | 1956-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-02 | 1959-09-01 | 1960-03-02 | $7700.00 | Window Closed / Lapsed |