US2524510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone ringing apparatus with vibratory reed of magnetic material
Assignee: NORTH ELECTRIC MANUFACTURING Co
•
Filing: 1947-03-05
•
Granted: 1950-10-03
•
Expires: 1967-03-05
Abstract
No abstract record available.
Inventors
- 👤 James M Blackhall
- 👤 Franklin J Hickman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:47
CPC Classifications
G; G10; G10K; G10K1/00; G10K1/06; G10K1/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US329782A
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US460503A
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US525145A
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US584352A
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US922006A
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US846227A
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US1624476A
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US1753689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-02 | 1954-04-03 | 1954-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-02 | 1958-04-03 | 1958-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-02 | 1962-04-03 | 1962-10-03 | $7700.00 | Window Closed / Lapsed |