Patent US3158678A successfully refreshed from Google Patents.
US3158678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical device
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1961-06-20
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Granted: 1964-11-24
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Expires: 1981-06-20
Abstract
No abstract record available.
Inventors
- 👤 Harold C Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/0147
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A LIGHT CONTROLLING DEVICE RESPONSIVE TO RADIO FREQUENCY BEAMS COMPRISING A MIXTURE OF SUBSTANCES THAT IS TRANSPARENT TO LIGHT ABOVE A CRITICAL TEMPERATURE, AND RELATIVELY OPAQUE BELOW SAID CRITICAL TEMPERATURE, MEANS FOR HEATING SAID MIXTURE ABOVE ITS CRITICAL TEMPERATURE IN RESPONSE TO A RADIANT MICROWAVE RADIO BEAM, SAID MEANS
Claim 2
Dependent Claim
49 words
A LIGHT CONTROLLING DEVICE RESPONSIVE TO RADIO FREQUENCY BEAMS COMPRISING A MIXTURE OF SUBSTANCES THAT IS TRANSPARENT TO LIGHT ABOVE A CRITICAL TEMPERATURE, AND RELATIVELY OPAQUE BELOW SAID CRITICAL TEMPERATURE, MEANS FOR HEATING SAID MIXTURE ABOVE ITS CRITICAL TEMPERATURE IN RESPONSE TO A RADIANT MICROWAVE RADIO BEAM, SAID MEANS
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Cited
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Cited
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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) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |