US2589180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiline telephone substation instrument and circuits
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1949-06-10
•
Granted: 1952-03-11
•
Expires: 1969-06-10
Abstract
No abstract record available.
Inventors
- 👤 Fredric E Wood
- 👤 Robert L Sargisson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:16
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/002; H04M9/005; H04M1/00; H04M1/02; H04M1/0289; H04M3/00; H04M3/42; H04M3/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1783310A
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US2212216A
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US2218328A
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US2273530A
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US2306203A
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US2338757A
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US2341711A
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US2356031A
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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) | 1955-03-11 | 1955-09-10 | 1956-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-11 | 1959-09-10 | 1960-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-11 | 1963-09-10 | 1964-03-11 | $7700.00 | Window Closed / Lapsed |