US1636178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable inductive device
Assignee: AT&T Inc
•
Filing: 1921-12-23
•
Granted: 1927-07-19
•
Expires: 1941-12-23
Abstract
No abstract record available.
Inventors
- 👤 John O Gargan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:37
CPC Classifications
H; H01; H01F; H01F21/00; H01F21/005; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1930-07-18 | 1931-01-17 | 1931-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-07-18 | 1935-01-17 | 1935-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-07-18 | 1939-01-17 | 1939-07-19 | $7700.00 | Window Closed / Lapsed |