Patent US4519385A successfully refreshed from Google Patents.
US2932729A
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Communication system with interlocking calling system
Assignee: International Standard Electric Corp
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Filing: 1954-01-28
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Granted: 1960-04-12
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Expires: 1974-01-28
Abstract
No abstract record available.
Inventors
- 👤 Yamato Shigeki
- 👤 Sudo Taro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:38
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24
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) | 1963-04-12 | 1963-10-12 | 1964-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-12 | 1967-10-12 | 1968-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-12 | 1971-10-12 | 1972-04-12 | $7700.00 | Window Closed / Lapsed |