US4021648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Function generator and application thereof
Assignee: Hitachi Ltd
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Filing: 1975-08-22
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Granted: 1977-05-03
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Expires: 1995-08-22
Abstract
Abstract A first function generator adapted to be digitally supplied with an angular signal φ at an input thereof and produce two types of functions, the ratio of which is approximate to tan φ, is series-connected with a second function generator for correcting a variation depending on the angular signal in the vector length of vectors having the two types of functions as their orthogonal components, whereby functions approximating cos φ and sin φ or the vectors of a substantially constant vector length are produced at the output of the first function generator.
Inventors
- 👤 Kunihiro Sakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:41
CPC Classifications
G; G06; G06J; G06J1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3566393A
Cited
US3688098A
Cited
US3675234A
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US3728719A
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US3832707A
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US3806917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |