Patent US2543694A successfully refreshed from Google Patents.
US2543694A
Expired / Lapsed
US
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Helicoid switch unit for signaling systems
Assignee: Teleregister Corp
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Filing: 1947-08-08
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Granted: 1951-02-27
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Expires: 1967-08-08
Abstract
No abstract record available.
Inventors
- 👤 Lawrence J Kamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:11
CPC Classifications
G; G08; G08B; G08B5/00; G08B5/22; G08B5/221
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1307369A
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US706048A
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US1080486A
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US1487409A
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US1747734A
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US1939822A
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US1952868A
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US1957901A
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US2368874A
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US2440665A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |