US2985759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferroelectric devices
Assignee: RCA Corp
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Filing: 1956-09-26
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Granted: 1961-05-23
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Expires: 1976-09-26
Abstract
No abstract record available.
Inventors
- 👤 George J Goldsmith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:17
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/025
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
AN INFRA RED RADIATION DETECTION DEVICE COMPRISING A PAIR OF ELECTRODES, A CRYSTAL OF COLEMANITE SPACING SAID PAIR OF ELECTRODES, SAID ELECTRODES ADAPTED TO PRODUCE A SUBSTANTIAL ELECTRIC FIELD PARALLEL TO THE 010 AXIS OF SAID CRYSTAL, MEANS FOR MAINTAINING SAID CRYSTAL AT A TEMPERATURE BELOW -2.5*C., CONNECTION MEANS FOR A SOURCE OF VOLTAGE ATTACHED TO SAID ELECTRODES, OPTICAL MEANS FOR DIRECTING ELECTROMAGNETIC RADIATION UPON SAID CRYSTAL, AND MEANS FOR DETECTING A CHANGE IN FREE SURFACE IN SAID BODY.
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) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |