Patent DE2507166A1 successfully refreshed from Google Patents.
Patent US3218911A successfully refreshed from Google Patents.
US3218911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric gauge employing a plurality of gratings
Assignee: North American Aviation Corp
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Filing: 1955-07-05
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Granted: 1965-11-23
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Expires: 1975-07-05
Abstract
No abstract record available.
Inventors
- 👤 John L Bower
- 👤 Wilton R Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:24
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A MEASURING DEVICE COMPRISING A PRIMARY OPTICAL ELEMENT HAVING SEVERAL HUNDRED PARALLEL, UNIFORMLYSPACED, OPAQUE LINES TO THE INCH THEREON, FOUR SECONDARY OPTICAL ELEMENTS HAVING THE SAME NUMBER OF OPAQUE LINES TO THE INCH THEREON, SAID SECONDARY OPTICAL ELEMENTS DISPOSED IN PROXIMATE RELATIONSHIP WITH SAID PRIMARY OPTICAL ELEMENT AND SAID SECONDARY OPTICAL ELEMENT DISPOSED SO AS TO GENERALLY TRANSMIT DIFFERENT AMOUNTS OF LIGHT WITH RESPECT TO EACH OTHER, SAID SECONDARY OPTICAL ELEMENTS ADAPTED TO MOVE AS A UNIT WITH RESPECT TO SAID PRIMARY OPTICAL ELEMENT SO AS TO BRING THE OPAQUE LINES OF SAID SECONDARY OPTICAL ELEMENTS INTO AND OUT OF REGISTER WITH THE OPAQUE LINES OF SAID PRIMARY ELEMENT, LIGHT SOURCE MEANS DISPOSED TO PROVIDE LIGHT THROUGH PRIMARY AND SAID
Claim 2
Dependent Claim
120 words
A MEASURING DEVICE COMPRISING A PRIMARY OPTICAL ELEMENT HAVING SEVERAL HUNDRED PARALLEL, UNIFORMLYSPACED, OPAQUE LINES TO THE INCH THEREON, FOUR SECONDARY OPTICAL ELEMENTS HAVING THE SAME NUMBER OF OPAQUE LINES TO THE INCH THEREON, SAID SECONDARY OPTICAL ELEMENTS DISPOSED IN PROXIMATE RELATIONSHIP WITH SAID PRIMARY OPTICAL ELEMENT AND SAID SECONDARY OPTICAL ELEMENT DISPOSED SO AS TO GENERALLY TRANSMIT DIFFERENT AMOUNTS OF LIGHT WITH RESPECT TO EACH OTHER, SAID SECONDARY OPTICAL ELEMENTS ADAPTED TO MOVE AS A UNIT WITH RESPECT TO SAID PRIMARY OPTICAL ELEMENT SO AS TO BRING THE OPAQUE LINES OF SAID SECONDARY OPTICAL ELEMENTS INTO AND OUT OF REGISTER WITH THE OPAQUE LINES OF SAID PRIMARY ELEMENT, LIGHT SOURCE MEANS DISPOSED TO PROVIDE LIGHT THROUGH PRIMARY AND SAID
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |