Patent US3251189A successfully refreshed from Google Patents.
Patent US2395243A successfully refreshed from Google Patents.
Patent US2830251A successfully refreshed from Google Patents.
US2830251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency changer
Assignee: Lanteris Space LLC
•
Filing: 1952-03-19
•
Granted: 1958-04-08
•
Expires: 1972-03-19
Abstract
No abstract record available.
Inventors
- 👤 John W Tiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:18
CPC Classifications
H; H03; H03B; H03B19/00; H03B19/03
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1678965A
Cited
US1569132A
Cited
US1907427A
Cited
US1919053A
Cited
US2022968A
Cited
US2291366A
Cited
US2418640A
Cited
US2387472A
Cited
US2461307A
Cited
US2470893A
Cited
US2443094A
Cited
US2625663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |