US3154688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Displacement measuring apparatus using a reflective grating and plural photocells
Assignee: Ferranti International PLC
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Filing: 1961-09-27
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Granted: 1964-10-27
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Expires: 1981-09-27
Abstract
No abstract record available.
Inventors
- 👤 Shepherd Alexander Turnbull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:55
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38; G01B; G01B21/00; G01B21/02; G01B21/06; G01B21/065; G01D5/347; G01D5/34707; G01D5/34715
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
MEASURING APPARATUS FOR DETERMINING THE EXTENT AND SENSE OF THE MOVEMENT OF ONE OBJECT IN ONE OR OTHER OF TWO OPPOSITE DIRECTIONS WITH RESPECT TO ANOTHER OBJECT INCLUDING (A) TWO CLOSELY-PARALLEL OPTICAL GRATINGS RULED WITH STRAIGHT LINES WHICH IS ONE GRATING ARE SLIGHTLY SKEW WITH RESPECT TO THE LINES OF THE OTHER GRATING SO AS TO SET UP A CYCLIC OPTICAL PATTERN IN THE DIRECTION OF THE LINES, ONE OF SAID GRATINGS BEING A REFLECTION GRATING AND THE OTHER BEING A TRANSMISSION GRATING, SAID GRATINGS BEING ARRANGED TO MOVE RELATIVE TO ONE ANOTHER IN A DIRECTION APPROXIMATELY NORMAL TO THE DIRECTION OF THE LINES IN DEPENDENCE ON SAID MOVEMENT OF THE ONE OBJECT WITH RESPECT TO THE OTHER, (B) AT LEAST TWO PHOTO-ELECTRIC TRANSDUCERS SPACED APART IN THE DIRECTION OF THE PATTERN, (C) AN OPTICAL SYSTEM FOR IRRADIATING EACH TRANSDUCER BY A LIGHT BEAM WHICH IS REFLECTED BY THE REFLECTION GRATING THROUGH THE TRANSMISSION GRATING AT THE POSI-
Claim 2
Dependent Claim
158 words
MEASURING APPARATUS FOR DETERMINING THE EXTENT AND SENSE OF THE MOVEMENT OF ONE OBJECT IN ONE OR OTHER OF TWO OPPOSITE DIRECTIONS WITH RESPECT TO ANOTHER OBJECT INCLUDING (A) TWO CLOSELY-PARALLEL OPTICAL GRATINGS RULED WITH STRAIGHT LINES WHICH IS ONE GRATING ARE SLIGHTLY SKEW WITH RESPECT TO THE LINES OF THE OTHER GRATING SO AS TO SET UP A CYCLIC OPTICAL PATTERN IN THE DIRECTION OF THE LINES, ONE OF SAID GRATINGS BEING A REFLECTION GRATING AND THE OTHER BEING A TRANSMISSION GRATING, SAID GRATINGS BEING ARRANGED TO MOVE RELATIVE TO ONE ANOTHER IN A DIRECTION APPROXIMATELY NORMAL TO THE DIRECTION OF THE LINES IN DEPENDENCE ON SAID MOVEMENT OF THE ONE OBJECT WITH RESPECT TO THE OTHER, (B) AT LEAST TWO PHOTO-ELECTRIC TRANSDUCERS SPACED APART IN THE DIRECTION OF THE PATTERN, (C) AN OPTICAL SYSTEM FOR IRRADIATING EACH TRANSDUCER BY A LIGHT BEAM WHICH IS REFLECTED BY THE REFLECTION GRATING THROUGH THE TRANSMISSION GRATING AT THE POSI-
References Cited (Backward Citations)
US2406299A
Cited
US2886717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |