Patent US3055986A successfully refreshed from Google Patents.
US3055986A
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US
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Signalling arrangement for automatic telephone systems
Assignee: International Standard Electric Corp
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Filing: 1958-10-10
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Granted: 1962-09-25
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Expires: 1978-10-10
Abstract
No abstract record available.
Inventors
- 👤 Hjertstrand Svante Lennart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:17
CPC Classifications
H; H04; H04Q; H04Q3/00; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/50; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44
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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |