US2434921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse amplitude selective system
Assignee: STC PLC
•
Filing: 1944-11-02
•
Granted: 1948-01-27
•
Expires: 1964-11-02
Abstract
No abstract record available.
Inventors
- 👤 Donald D Grieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:03
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/153
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2157677A
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GB290979A
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US2153202A
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US2241170A
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US2180355A
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US2286450A
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US2212173A
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US2326584A
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US2294341A
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US2310692A
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US2344697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-26 | 1951-07-28 | 1952-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-26 | 1955-07-28 | 1956-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-26 | 1959-07-28 | 1960-01-27 | $7700.00 | Window Closed / Lapsed |