US3523231A
Expired / Lapsed
US
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Servomechanism including pulse train commands,pulse feedback from an optical encoder,and phase comparison means
Assignee: Ferranti International PLC
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Filing: 1969-02-26
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Granted: 1970-08-04
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Expires: 1989-02-26
Abstract
No abstract record available.
Inventors
- 👤 Hugh Macdonald Arthur
- 👤 John Young Condie Montgomery
- 👤 Donald Ferguson Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:28
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/33; G05B19/35; G05B19/351; G05B19/353; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37176; G05B2219/41; G05B2219/41464
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) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |