Patent US1171598A successfully refreshed from Google Patents.
US1171598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark-gap for radiotone wireless-telegraph systems.
Assignee: Radio Telephone & Telegraph Co
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Filing: 1910-03-10
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Granted: 1916-02-15
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Expires: 1930-03-10
Abstract
No abstract record available.
Inventors
- 👤 Lee De Forest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:41
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/40
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) | 1919-02-14 | 1919-08-16 | 1920-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1923-02-14 | 1923-08-16 | 1924-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1927-02-14 | 1927-08-16 | 1928-02-15 | $7700.00 | Window Closed / Lapsed |