US2499606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preset type telephone dialer with pulse generating transformers
Assignee: AT&T Inc
•
Filing: 1948-07-16
•
Granted: 1950-03-07
•
Expires: 1968-07-16
Abstract
No abstract record available.
Inventors
- 👤 David B Parkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:35
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/27; H04M1/272
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US548406A
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US1972289A
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US1966315A
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US2072572A
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US2036037A
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US2085884A
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US2100390A
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US2252766A
Cited
US2396211A
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US2448812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |