US1994624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system
Assignee: AT&T Inc
•
Filing: 1933-01-07
•
Granted: 1935-03-19
•
Expires: 1953-01-07
Abstract
No abstract record available.
Inventors
- 👤 Sultzer Morton
- 👤 Leland K Swart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:23
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/52
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) | 1938-03-18 | 1938-09-17 | 1939-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-18 | 1942-09-17 | 1943-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-18 | 1946-09-17 | 1947-03-19 | $7700.00 | Window Closed / Lapsed |