Patent US2541198A successfully refreshed from Google Patents.
US2541198A
Expired / Lapsed
US
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Amplifier
Assignee: Individual
•
Filing: 1948-04-14
•
Granted: 1951-02-13
•
Expires: 1968-04-14
Abstract
No abstract record available.
Inventors
- 👤 Irving R Brenholdt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:28
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1445278A
Cited
US1814158A
Cited
US2206123A
Cited
GB515158A
Cited
US2171614A
Cited
US2252057A
Cited
US2356296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |