US2928058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency attenuator circuit
Assignee: HP Inc
•
Filing: 1954-08-11
•
Granted: 1960-03-08
•
Expires: 1974-08-11
Abstract
No abstract record available.
Inventors
- 👤 Peter D Lacy
- 👤 Daniel E Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:05
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2661441A
Cited
US2626371A
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US2650350A
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US2725499A
Cited
US2588832A
Cited
DE856469C
Cited
US2829300A
Cited
US2811673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |