US2667533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic message switching system
Assignee: AT&T Teletype Corp
•
Filing: 1950-05-10
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Granted: 1954-01-26
•
Expires: 1970-05-10
Abstract
No abstract record available.
Inventors
- 👤 Walter J Zenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:01
CPC Classifications
H; H04; H04L; H04L17/00; H04L17/02; H04L17/12; H04L12/00; H04L12/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2357297A
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US2484838A
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US2318168A
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US2444078A
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US2451045A
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US2404339A
Cited
US2486360A
Cited
US2505728A
Cited
US2522453A
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US2456740A
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US2584997A
Cited
US2575329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |