US3598532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and method for crucible leak detection
Assignee: Lockheed Martin Tactical Systems Inc
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Filing: 1968-11-29
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Granted: 1971-08-10
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Expires: 1988-11-29
Abstract
Abstract MEANS AND METHOD FOR DETECTING LEAKS IN PLATINUM CRUCIBLES DURING THE PERIOD OF CRYSTAL GROTH IN THE MANUFACTURE OF SYNTHETIC CHEMICAL STRUCTURES USING A SOLVENT SUCH AS LEAD OXIDE AND/OR LEAD FLUORIDE. LEAKS ARE DETECTED BY SAMPLING SMALL QUANTITIES OF AIR IN THE FURNANCE, AND TESTING FOR THE PRESENCE OF LEAD OR OTHER SOLVENTS. THE LEAD PARTICLES ARE TRAPPED ON A DISC OF FILTER PAPER, AND DETECTED BY MEANS OF A CHEMICAL REACTION WHICH CHANGES THE LEAD TO BLACK DEPOSIT OF LEAD SULPHIDE. OTHER ELEMENTS ARE DETECTED BY SPECTROSCOPIC METHODS.
Inventors
- 👤 Irving Adams
- 👤 Richard F Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:44
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; C; C30; C30B; C30B9/00; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25875
Claims Analysis
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |