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US2664459A
Expired / Lapsed
US
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Automatic switching means for use in telegraph systems and the like
Assignee: Individual
•
Filing: 1951-10-02
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Granted: 1953-12-29
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Expires: 1971-10-02
Abstract
No abstract record available.
Inventors
- 👤 Roelof M M Oberman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:15
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/02; H04L12/16; H04L12/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |