US3291554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical neutral controllable density filter
Assignee: Individual
•
Filing: 1963-02-19
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Granted: 1966-12-13
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Expires: 1983-02-19
Abstract
No abstract record available.
Inventors
- 👤 Edgar E Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:00
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
AN OPTICAL SYSTEM FOR CONTROLLING THE FRACTION OF INCIDENT LIGHT TOTALLY INTERNALLY REFLECTED FROM AN OPTICAL SURFACE FORMING AN INTERFACE BETWEEN TWO OPTICALLY TRANSPARENT MEDIA IN RESPONSE TO AN APPLIED SIGNAL COMPRISING; AN OPTICALLY TRANSPARENT BODY, A PLANE SURFACE ON SAID BODY FOR RECEIVING LIGHT RAYS FROM WITHIN SAID BODY INCIDENT UPON SAID SURFACE AT AN ANGLE GREATER THAN THE ANGLE FOR TOTAL INTERNAL REFLECTION, AN OPTICALLY TRANSPARENT ELEMENT INCLUDING A PLANE GRATING HAVING A SERIES OF SUCCESSIVE RIDGES SPACED FROM BUT ADJACENT TO SAID PLANE SURFACE, MEANS FOR MOVING SAID ELEMENT WITHIN AT MAXIMUM 3 TO 5 WAVELENGTHS FROM SAID PLANE SURFACE IN RESPONSE TO AN APPLIED SIGNAL, SAID RIDGES HAVING FACES ORIENTED TO INTERCEPT AND ABSORB A PORTION OF SAID LIGHT RAYS WHEN SAID ELEMENT IS WITHIN 3 TO 5 WAVELENGTHS FROM SAID PLANE SURFACE WHEREBY THE FRACTION OF LIGHT REFLECTED FROM SAID PLANE SURFACE IS CONTROLLED.
Claim 2
Dependent Claim
149 words
AN OPTICAL SYSTEM FOR CONTROLLING THE FRACTION OF INCIDENT LIGHT TOTALLY INTERNALLY REFLECTED FROM AN OPTICAL SURFACE FORMING AN INTERFACE BETWEEN TWO OPTICALLY TRANSPARENT MEDIA IN RESPONSE TO AN APPLIED SIGNAL COMPRISING; AN OPTICALLY TRANSPARENT BODY, A PLANE SURFACE ON SAID BODY FOR RECEIVING LIGHT RAYS FROM WITHIN SAID BODY INCIDENT UPON SAID SURFACE AT AN ANGLE GREATER THAN THE ANGLE FOR TOTAL INTERNAL REFLECTION, AN OPTICALLY TRANSPARENT ELEMENT INCLUDING A PLANE GRATING HAVING A SERIES OF SUCCESSIVE RIDGES SPACED FROM BUT ADJACENT TO SAID PLANE SURFACE, MEANS FOR MOVING SAID ELEMENT WITHIN AT MAXIMUM 3 TO 5 WAVELENGTHS FROM SAID PLANE SURFACE IN RESPONSE TO AN APPLIED SIGNAL, SAID RIDGES HAVING FACES ORIENTED TO INTERCEPT AND ABSORB A PORTION OF SAID LIGHT RAYS WHEN SAID ELEMENT IS WITHIN 3 TO 5 WAVELENGTHS FROM SAID PLANE SURFACE WHEREBY THE FRACTION OF LIGHT REFLECTED FROM SAID PLANE SURFACE IS CONTROLLED.
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) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |