Patent US2638505A successfully refreshed from Google Patents.
US2638505A
Expired / Lapsed
US
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Pulse electronic switching system
Assignee: International Standard Electric Corp
•
Filing: 1948-03-24
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Granted: 1953-05-12
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Expires: 1968-03-24
Abstract
No abstract record available.
Inventors
- 👤 Stanislas Van Mierlo
- 👤 Derjavitch Boris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:51
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04L; H04L5/00; H04L5/22; H04L5/24; H04L5/245; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/526
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1905359A
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US2277192A
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US2341919A
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US2387018A
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US2356519A
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US2356514A
Cited
US2379715A
Cited
US2462896A
Cited
US2490833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |