US2582691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impulse testing and test impulse generating set
Assignee: AT&T Inc
•
Filing: 1948-10-29
•
Granted: 1952-01-15
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Expires: 1968-10-29
Abstract
No abstract record available.
Inventors
- 👤 Walter W Fritschi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:07
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M3/00; H04M3/08; H04M3/12; H04M3/22; H04M3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1933274A
Cited
US2193868A
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US2366076A
Cited
US2411648A
Cited
US2420516A
Cited
US2462945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |