US2588684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charge rate calculator for automatic telephony
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1947-04-25
•
Granted: 1952-03-11
•
Expires: 1967-04-25
Abstract
No abstract record available.
Inventors
- 👤 Stehlik Rudolph Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:23
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/04; H04M15/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2305779A
Cited
GB510012A
Cited
US2253596A
Cited
US2273165A
Cited
US2272475A
Cited
US2369071A
Cited
US9222905B2
Cited
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 |