US2728052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable band pass filter
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1950-07-01
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Granted: 1955-12-20
•
Expires: 1970-07-01
Abstract
No abstract record available.
Inventors
- 👤 John P Van Duyne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:54
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161; H03H7/0169; Y; Y10; Y10S; Y10S411/00; Y10S411/919
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1641438A
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US2147425A
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US2204086A
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GB541712A
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US2346584A
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US2403349A
Cited
US2435630A
Cited
US2464377A
Cited
US2519009A
Cited
US2564740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |