US3127465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-phase interferometer
Assignee: General Precision Inc
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Filing: 1961-01-16
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Granted: 1964-03-31
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Expires: 1981-01-16
Abstract
No abstract record available.
Inventors
- 👤 Richard G Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:35
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02; G01B9/02001; G01B9/02002; G01B9/02003; G01B9/02007; G01B9/02015; G01B9/02017; G01B9/02019; G01B9/02027; G01B9/02055; G01B9/02056; G01B9/02057; G03; G03F; G03F7/00; G03F7/70; G03F7/70691; G03F7/70775; G01B2290/00; G01B2290/45; G01B2290/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
AN INTERFEROMETER COMPRISING, (A) A BEAM-SPLITTER MEANS OPERABLE TO PROVIDE FROM AN INCIDENT LIGHT BEAM A PAIR OF LIGHT BEAMS; (B) RETROREFLECTOR MEANS POSITIONED IN THE OPTICAL PATH OF ONE OF SAID PAIR OF LIGHT BEAMS; (C) PHASE-SHIFTING MEANS POSITIONED IN THE OPTICAL PATH OF SAID ONE OF SAID PAIR OF LIGHT BEAMS EFFECTIVE TO SHIFT UNEQUALLY THE PHASE OF AT LEAST TWO PORTIONS OF SAID BEAM WITH RESPECT TO THE REMAINING PORTION THEREOF, THE FIRST OF SAID TWO PORTIONS BEING SHIFTED BY N/6 WAVELENGTHS AND THE SECOND OF SAID TWO PORTIONS BEING SHIFTED BY 2N/6 WAVELENGTHS WHEREIN N IS AN ADD INTEGER; AND (D) MEANS FOR IMAGING THE SEPARATE FIELDS OF ILLUMINATIONS PRODUCED BY RECOMBINING SAID PHASE-SHIFTED PORTIONS OF SAID ONE OF SAID PAIR OF LIGHT BEAMS AND SAID REMAINING PORTION THEREOF WITH THE OTHER OF SAID PAIR OF LIGHT BEAMS AT SAID BEAM-SPLITTER MEANS UPON A CORRESPONDING PLURALITY OF PHOTO-DEVICES EACH OF WHICH IS SUBSTANTIALLY CONTINUOUSLY RESPONSIVE TO ONE OF SAID SEPARATE FIELDS OF ILLUMINATION.
Claim 2
Dependent Claim
167 words
AN INTERFEROMETER COMPRISING, (A) A BEAM-SPLITTER MEANS OPERABLE TO PROVIDE FROM AN INCIDENT LIGHT BEAM A PAIR OF LIGHT BEAMS; (B) RETROREFLECTOR MEANS POSITIONED IN THE OPTICAL PATH OF ONE OF SAID PAIR OF LIGHT BEAMS; (C) PHASE-SHIFTING MEANS POSITIONED IN THE OPTICAL PATH OF SAID ONE OF SAID PAIR OF LIGHT BEAMS EFFECTIVE TO SHIFT UNEQUALLY THE PHASE OF AT LEAST TWO PORTIONS OF SAID BEAM WITH RESPECT TO THE REMAINING PORTION THEREOF, THE FIRST OF SAID TWO PORTIONS BEING SHIFTED BY N/6 WAVELENGTHS AND THE SECOND OF SAID TWO PORTIONS BEING SHIFTED BY 2N/6 WAVELENGTHS WHEREIN N IS AN ADD INTEGER; AND (D) MEANS FOR IMAGING THE SEPARATE FIELDS OF ILLUMINATIONS PRODUCED BY RECOMBINING SAID PHASE-SHIFTED PORTIONS OF SAID ONE OF SAID PAIR OF LIGHT BEAMS AND SAID REMAINING PORTION THEREOF WITH THE OTHER OF SAID PAIR OF LIGHT BEAMS AT SAID BEAM-SPLITTER MEANS UPON A CORRESPONDING PLURALITY OF PHOTO-DEVICES EACH OF WHICH IS SUBSTANTIALLY CONTINUOUSLY RESPONSIVE TO ONE OF SAID SEPARATE FIELDS OF ILLUMINATION.
References Cited (Backward Citations)
DE465365C
Cited
US2604004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-31 | 1967-09-30 | 1968-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-31 | 1971-09-30 | 1972-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-31 | 1975-09-30 | 1976-03-31 | $7700.00 | Window Closed / Lapsed |