US3521170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transversal digital filters having analog to digital converter for analog signals
Assignee: US Philips Corp
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Filing: 1967-02-28
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Granted: 1970-07-21
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Expires: 1987-02-28
Abstract
No abstract record available.
Inventors
- 👤 Peter Leuthold
- 👤 Petrus Josephus Van Gerwen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:42
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03114; H04L25/03133; H03; H03H; H03H17/00; H03H17/02; H03H17/06; H03H17/0614
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |