US2644932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse amplitude responsive selective system
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1948-12-07
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Granted: 1953-07-07
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Expires: 1968-12-07
Abstract
No abstract record available.
Inventors
- 👤 Ericsson Eric Arvid
- 👤 Hullegard Erik Waldemar
- 👤 Jacobaeus Anton Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:34
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22794E
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US1242009A
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US1459859A
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US1800019A
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US1736283A
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US1952368A
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US1982290A
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US2360751A
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US2441269A
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US2440249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |