US2415437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone exchange apparatus
Assignee: NORTH ELECTRIC MANUFACTURING Co
•
Filing: 1940-07-29
•
Granted: 1947-02-11
•
Expires: 1960-07-29
Abstract
No abstract record available.
Inventors
- 👤 Frank R Mcberty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:02
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/02; H04Q1/16; H01; H01H; H01H63/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US767703A
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US1046952A
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US1215859A
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US1318178A
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US1275846A
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US1528767A
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US1472503A
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US1659627A
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US1819675A
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US2123229A
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US2214907A
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US2187115A
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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) | 1950-02-10 | 1950-08-12 | 1951-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-10 | 1954-08-12 | 1955-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-10 | 1958-08-12 | 1959-02-11 | $7700.00 | Window Closed / Lapsed |