US4812643B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detector device for a blade tracking system having two sensors
Assignee: Stewart Hughes Ltd
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Filing: 1988-03-16
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Granted: 1994-03-22
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Expires: 2008-03-16
Abstract
Abstract The device relates to a detector for a blade (30) tracking system which detector comprises lens means (11) for focusing in a plane (14) a bundle of radiation passing therethrough characterised in the two or more radiation sensors (21,22) are disposed within said plane, the arrangement being such an object (30) being sensed passing through the radiation bundle is sensed sequentially by said sensors.
Inventors
- 👤 Richard Talbot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:48
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/16; B; B64; B64C; B64C27/00; B64C27/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-21 | 1997-09-20 | 1998-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-21 | 2001-09-20 | 2002-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-21 | 2005-09-20 | 2006-03-22 | $7700.00 | Window Closed / Lapsed |