US2209395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling system
Assignee: International Business Machines Corp
•
Filing: 1937-12-21
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Granted: 1940-07-30
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Expires: 1957-12-21
Abstract
No abstract record available.
Inventors
- 👤 Clyde J Fitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:46
CPC Classifications
H; H04; H04L; H04L13/00; H04L13/02; H04L13/10; H04L13/12; H04L13/14; H03; H03B; H03B19/00; H03B19/06; H03B19/08; H03B19/10; H03K; H03K5/00; H03K5/153; H03K5/1536; H04M; H04M19/00; H04M19/02
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) | 1943-07-30 | 1944-01-29 | 1944-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-07-30 | 1948-01-29 | 1948-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-07-30 | 1952-01-29 | 1952-07-30 | $7700.00 | Window Closed / Lapsed |