US2689308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detecting device
Assignee: Polaroid Corp
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Filing: 1952-05-22
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Granted: 1954-09-14
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Expires: 1972-05-22
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:30
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
AN X- AND GAMMA RADIATION DETECTING DEVICE COMPRISING A CASING, A DETECTING ELEMENT MOUNTED WITHIN SAID CASING, SAID DETECTING ELEMENT INCLUDING A POTASSIUM BROMIDE CRYSTAL WHICH BECOMES BLUE IN COLOR WHEN SUBJECTED TO X- OR GAMMA RADIATION A TRANSPARENT ELEMENT FOR PROVIDING A TRANSPARENT OPTICAL PATH, SAID TRANSPARENT ELEMENT BEING IN SURROUNDING RELATION TO SAID DETECTING ELEMENT, SAID DETECTING ELEMENT AND SAID TRANSPARENT ELEMENT BEING ADAPTED TO BE ILLUMINATED, MEANS FOR DIFFUSING LIGHT THAT ITS RECEIVED BY SAID DETECTING ELEMENT AND BY SAID TRANSPARENT ELEMENT, A RED FILTER FOR LIGHT PASSING THROUGH SAID DETECTING ELEMENT AND TRANSPARENT ELEMENT, A FIRST POLARIZING MEANS FOR RECEIVING LIGHT FROM SAID DETECTING ELEMENT, A SECOND POLARIZING MEANS FOR RECEIVING LIGHT FROM SAID TRANSPARENT ELEMENT, THE AXIS OF TRANSMISSION OF SAID FIRST POLARIZING MEANS BEING AT AN ANGLE TO THE AXIS OF TRANSMISSION OF SAID SECOND POLARIZING MEANS, ROTATABLE POLARIZING MEANS FOR COMPARING LIGHT PASSING THROUGH SAID FIRST AND SECOND POLARIZING MEANS, AND MEANS FOR INDICATING THE ANGULAR POSITION OF SAID ROTATABLE POLARIZING MEANS WITH RESPECT TO SAID FIRST AND SECOND POLARIZING MEANS.
Claim 2
Dependent Claim
178 words
AN X- AND GAMMA RADIATION DETECTING DEVICE COMPRISING A CASING, A DETECTING ELEMENT MOUNTED WITHIN SAID CASING, SAID DETECTING ELEMENT INCLUDING A POTASSIUM BROMIDE CRYSTAL WHICH BECOMES BLUE IN COLOR WHEN SUBJECTED TO X- OR GAMMA RADIATION A TRANSPARENT ELEMENT FOR PROVIDING A TRANSPARENT OPTICAL PATH, SAID TRANSPARENT ELEMENT BEING IN SURROUNDING RELATION TO SAID DETECTING ELEMENT, SAID DETECTING ELEMENT AND SAID TRANSPARENT ELEMENT BEING ADAPTED TO BE ILLUMINATED, MEANS FOR DIFFUSING LIGHT THAT ITS RECEIVED BY SAID DETECTING ELEMENT AND BY SAID TRANSPARENT ELEMENT, A RED FILTER FOR LIGHT PASSING THROUGH SAID DETECTING ELEMENT AND TRANSPARENT ELEMENT, A FIRST POLARIZING MEANS FOR RECEIVING LIGHT FROM SAID DETECTING ELEMENT, A SECOND POLARIZING MEANS FOR RECEIVING LIGHT FROM SAID TRANSPARENT ELEMENT, THE AXIS OF TRANSMISSION OF SAID FIRST POLARIZING MEANS BEING AT AN ANGLE TO THE AXIS OF TRANSMISSION OF SAID SECOND POLARIZING MEANS, ROTATABLE POLARIZING MEANS FOR COMPARING LIGHT PASSING THROUGH SAID FIRST AND SECOND POLARIZING MEANS, AND MEANS FOR INDICATING THE ANGULAR POSITION OF SAID ROTATABLE POLARIZING MEANS WITH RESPECT TO SAID FIRST AND SECOND POLARIZING MEANS.
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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) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |