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Patent US3457480A successfully refreshed from Google Patents.
US3457480A
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Tape controlled servo for a machine tool including a unique pulse width modulated motor control
Assignee: Ferranti International PLC
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Filing: 1966-05-18
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Granted: 1969-07-22
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Expires: 1986-05-18
Abstract
No abstract record available.
Inventors
- 👤 Ernest Thomas Angus
- 👤 Hugh Macdonald Arthur
- 👤 John Young Condie Montgomery
- 👤 Donald Ferguson Walker
- 👤 Richard Samuel Jonathan Good
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:55
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/18; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/33; G05B19/35; G05B19/351; G05B2219/00; G05B2219/30; G05B2219/36; G05B2219/36575; 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) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |