US2489638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for switching on and initiating processes by means of telephone calls
Assignee: IPSOPHON PATENTGESELLSCHAFT A
•
Filing: 1945-03-20
•
Granted: 1949-11-29
•
Expires: 1965-03-20
Abstract
No abstract record available.
Inventors
- 👤 Handschin Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:49
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/64; H04M1/65; H04M1/652; H04M1/6515
Claims Analysis
Total Claims: 0
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US2230486A
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US2238976A
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US2306654A
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US2368826A
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US2399738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |