Patent US1895774A successfully refreshed from Google Patents.
US1895774A
Expired / Lapsed
US
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Signal shaping circuit
Assignee: AT&T Inc
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Filing: 1932-01-12
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Granted: 1933-01-31
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Expires: 1952-01-12
Abstract
No abstract record available.
Inventors
- 👤 Florent E A Smets
- 👤 Carl F Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:54
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03878; H04L25/20; H04L25/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-01-31 | 1936-08-01 | 1937-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-01-31 | 1940-08-01 | 1941-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-01-31 | 1944-08-01 | 1945-01-31 | $7700.00 | Window Closed / Lapsed |