US1134840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuning-transformer for wireless systems.
Assignee: Individual
•
Filing: 1913-12-15
•
Granted: 1915-04-06
•
Expires: 1933-12-15
Abstract
No abstract record available.
Inventors
- 👤 Robert R Goldthorp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:22
CPC Classifications
H; H01; H01F; H01F21/00; H01F21/005
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) | 1918-04-05 | 1918-10-05 | 1919-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1922-04-05 | 1922-10-05 | 1923-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1926-04-05 | 1926-10-05 | 1927-04-06 | $7700.00 | Window Closed / Lapsed |