Patent US3471239A successfully refreshed from Google Patents.
US3471239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferometric apparatus
Assignee: Singer General Precision Inc
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Filing: 1966-01-10
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Granted: 1969-10-07
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Expires: 1986-01-10
Abstract
No abstract record available.
Inventors
- 👤 Robert A Woodson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:32
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
AN INTERFEROMETRIC APPARATUS FOR ACCURATELY DETERMINING ANGULAR DISPLACEMENTS COMPRISING, (A) A BEAM SPLITTING MIRROR FOR PRODUCING A DIVERGING BIPHASE PAIR OF BEAMS; (B) FIRST RETROREFLECTING MEANS FOR INTERCEPTING ONE OF SAID BEAMS AND PROVIDING A FIRST REFLECTED BEAM IN A PREDETERMINED DIRECTION AT A PREDETERMINED ANGLE WITH RESPECT TO SAID ONE BEAM; (C) SECOND RETROREFLECTING MEANS FOR INTERCEPTING THE OTHER OF SAID BEAMS PROVIDING A SECOND REFLECTED BEAM IN SAID PREDETERMINED DIRECTION AND AT SAID PREDETERMINED ANGLE WITH RESPECT TO SAID OTHER BEAM; (D) SAID FIRST AND SECOND RETROREFLECTING MEANS BEING ROTATABLE ABOUT A COMMON AXIS; (E) MIRROR MEANS FOR REDIRECTING SAID FIRST AND SECOND REFLECTED BEAMS BACK INTO SAID FIRST AND SECOND RETROREFLECTING MEANS, SAID BEAMS UPON FURTHER REFLECTION FROM SAID RETROREFLECTING MEANS FORMING A CONVERGING PAIR OF BIPHASE BEAMS; AND (F) MEANS INCLUDING A BEAM SPLITTING MIRROR FOR RECOMBINING SAID CONVERGING BEAMS TO FORM INTERFERENCE FRINGES AND REVERSIBLE COUNTER MEANS FOR INDICATING ANGULAR DISPLACEMENT OF SAID FIRST AND SECOND RETROREFLECTING MEANS WITH RESPECT TO PREDETERMINED DIRECTION.
Claim 2
Dependent Claim
168 words
AN INTERFEROMETRIC APPARATUS FOR ACCURATELY DETERMINING ANGULAR DISPLACEMENTS COMPRISING, (A) A BEAM SPLITTING MIRROR FOR PRODUCING A DIVERGING BIPHASE PAIR OF BEAMS; (B) FIRST RETROREFLECTING MEANS FOR INTERCEPTING ONE OF SAID BEAMS AND PROVIDING A FIRST REFLECTED BEAM IN A PREDETERMINED DIRECTION AT A PREDETERMINED ANGLE WITH RESPECT TO SAID ONE BEAM; (C) SECOND RETROREFLECTING MEANS FOR INTERCEPTING THE OTHER OF SAID BEAMS PROVIDING A SECOND REFLECTED BEAM IN SAID PREDETERMINED DIRECTION AND AT SAID PREDETERMINED ANGLE WITH RESPECT TO SAID OTHER BEAM; (D) SAID FIRST AND SECOND RETROREFLECTING MEANS BEING ROTATABLE ABOUT A COMMON AXIS; (E) MIRROR MEANS FOR REDIRECTING SAID FIRST AND SECOND REFLECTED BEAMS BACK INTO SAID FIRST AND SECOND RETROREFLECTING MEANS, SAID BEAMS UPON FURTHER REFLECTION FROM SAID RETROREFLECTING MEANS FORMING A CONVERGING PAIR OF BIPHASE BEAMS; AND (F) MEANS INCLUDING A BEAM SPLITTING MIRROR FOR RECOMBINING SAID CONVERGING BEAMS TO FORM INTERFERENCE FRINGES AND REVERSIBLE COUNTER MEANS FOR INDICATING ANGULAR DISPLACEMENT OF SAID FIRST AND SECOND RETROREFLECTING MEANS WITH RESPECT TO PREDETERMINED DIRECTION.
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) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |