US2883472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiphone for use in telephone systems
Assignee: General Telephone Laboratories Inc
•
Filing: 1954-08-23
•
Granted: 1959-04-21
•
Expires: 1974-08-23
Abstract
No abstract record available.
Inventors
- 👤 Stehlik Rudolph Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:47
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/58; H04M3/56; H04M9/00; H04M9/002; H04M9/005; H04Q; H04Q3/00; H04Q3/58; H04Q3/62; H04Q3/625
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2278410A
Cited
US2374072A
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US2385515A
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US2377562A
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US2534850A
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US2549719A
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US2561946A
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US2700070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |