US2599358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Call data recording automatic telephone system
Assignee: AT&T Inc
•
Filing: 1948-10-29
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Granted: 1952-06-03
•
Expires: 1968-10-29
Abstract
No abstract record available.
Inventors
- 👤 Harold D Cahill
- 👤 Warren W Carpenter
- 👤 Thomas L Dimond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:30
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US111638A
Cited
US2270246A
Cited
US2252766A
Cited
US2351551A
Cited
US2428376A
Cited
US2490441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |