US3468609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser grating interferometer
Assignee: National Aeronautics and Space Administration
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Filing: 1966-04-26
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Granted: 1969-09-23
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Expires: 1986-04-26
Abstract
No abstract record available.
Inventors
- 👤 James R Sterrett
- 👤 James C Emery
- 👤 John B Barber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:12
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/42; G02B27/4233; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
AN INTERFEROMETER COMPRISING A COHERENT, MONOCHROMATIC LASER LIGHT SOURCE, PERFORATE STOP MEANS INTERRUPTING PART OF THE DIVERGENT LIGHT FROM SAID SOURCE WHILE PERMITTING PART OF THE DIVERGENT LIGHT TO PASS THERETHROUGH, FIRST REFLECTING MEANS REFLECTING THE LIGHT THAT PASSES THROUGH SAID STOP MEANS, MEANS FOR DISTURBING AND THEREBY VARYING THE DENSITY OF A PORTION OF THE LIGHT REFLECTED BY SAID FIRST REFLECTING MEANS, SECOND REFLECTING MEANS RECEIVING AND FOCUSING THE DISTURBED AND UNDISTURBED PORTIONS OF SAID REFLECTED LIGHT ONTO A DIFFRACTION GRATING, SAID DIFFRACTION GRATING BEING DISPOSED NEAR THE IMAGE OF SAID LIGHT SOURCE, AND SERVING TO BREAK THE DISTURBED AND UNDISTURBED LIGHT BEAMS INTO A SERIES OF OVERLAPPING DIFFFRACTED ORDERS SO AS TO FORM DETECTABLE INTERFERENCE FRINGES WHERE SAID ORDERS OVERLAP.
Claim 2
Dependent Claim
122 words
AN INTERFEROMETER COMPRISING A COHERENT, MONOCHROMATIC LASER LIGHT SOURCE, PERFORATE STOP MEANS INTERRUPTING PART OF THE DIVERGENT LIGHT FROM SAID SOURCE WHILE PERMITTING PART OF THE DIVERGENT LIGHT TO PASS THERETHROUGH, FIRST REFLECTING MEANS REFLECTING THE LIGHT THAT PASSES THROUGH SAID STOP MEANS, MEANS FOR DISTURBING AND THEREBY VARYING THE DENSITY OF A PORTION OF THE LIGHT REFLECTED BY SAID FIRST REFLECTING MEANS, SECOND REFLECTING MEANS RECEIVING AND FOCUSING THE DISTURBED AND UNDISTURBED PORTIONS OF SAID REFLECTED LIGHT ONTO A DIFFRACTION GRATING, SAID DIFFRACTION GRATING BEING DISPOSED NEAR THE IMAGE OF SAID LIGHT SOURCE, AND SERVING TO BREAK THE DISTURBED AND UNDISTURBED LIGHT BEAMS INTO A SERIES OF OVERLAPPING DIFFFRACTED ORDERS SO AS TO FORM DETECTABLE INTERFERENCE FRINGES WHERE SAID ORDERS OVERLAP.
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) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |