US2201986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system
Assignee: AT&T Inc
•
Filing: 1938-06-17
•
Granted: 1940-05-28
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Expires: 1958-06-17
Abstract
No abstract record available.
Inventors
- 👤 Raymond E Collis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:56
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/50; H04M3/51; H04M3/523; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-05-28 | 1943-11-27 | 1944-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-28 | 1947-11-27 | 1948-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-28 | 1951-11-27 | 1952-05-28 | $7700.00 | Window Closed / Lapsed |