US3248602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of spectrographic analysis
Assignee: Bethlehem Steel Corp
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Filing: 1960-10-04
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Granted: 1966-04-26
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Expires: 1980-10-04
Abstract
No abstract record available.
Inventors
- 👤 Paul R Irish
- 👤 Nikkel Henry
- 👤 John B Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:26
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/66; G01N21/67
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A METHOD OF SPECTROCHEMICAL ANALYSIS OF A SAMPLE OF METAL COMPRISING MAKING SAID SAMPLE AN ELECTRODE OF A SPARK GAP IN AN ELECTRIC SPARKING CIRCUIT AND CAUSING A SUCCESSION OF SHORT INTENSE SPARKS TO JUMP SAID SPARK GAP EACH OF SAID INDIVIDUAL SPARKS HAVING A PEAK CURRENT OF AT LEAST 1000 AMPERES AND A DURATION SUCH THAT THE SPARK CURRENT FALLS TO BELOW 30% OF THE PEAK CURRENT VALUE IN NOT MORE THAN 8 MICROSECONDS, THE MINIMUM NUMERICAL PRODUCT OF SAID CURRENT AND DURATION VALUES BEING BETWEEN 8000 AND 10,000, ENCLOSING SAID SPARK GAP IN A CONTROLLED ATMOSPHERE CONSISTING OF AT LEAST ONE GAS OF THE GROUP OF GASES CONSISTING OF NITROGEN, HELIUM, AND HYDROGEN, AND THEREBY SUITABLY EXCITING THE 2296.86A CIII LINE OF THE CARBON SPECTRUM FOR SPECTROCHEMICAL ANALYSIS OF METAL FOR CARBON.
Claim 2
Independent Claim
134 words
A METHOD OF SPECTROCHEMICAL ANALYSIS OF A SAMPLE OF METAL COMPRISING MAKING SAID SAMPLE AN ELECTRODE OF A SPARK GAP IN AN ELECTRIC SPARKING CIRCUIT AND CAUSING A SUCCESSION OF SHORT INTENSE SPARKS TO JUMP SAID SPARK GAP EACH OF SAID INDIVIDUAL SPARKS HAVING A PEAK CURRENT OF AT LEAST 1000 AMPERES AND A DURATION SUCH THAT THE SPARK CURRENT FALLS TO BELOW 30% OF THE PEAK CURRENT VALUE IN NOT MORE THAN 8 MICROSECONDS, THE MINIMUM NUMERICAL PRODUCT OF SAID CURRENT AND DURATION VALUES BEING BETWEEN 8000 AND 10,000, ENCLOSING SAID SPARK GAP IN A CONTROLLED ATMOSPHERE CONSISTING OF AT LEAST ONE GAS OF THE GROUP OF GASES CONSISTING OF NITROGEN, HELIUM, AND HYDROGEN, AND THEREBY SUITABLY EXCITING THE 2296.86A CIII LINE OF THE CARBON SPECTRUM FOR SPECTROCHEMICAL ANALYSIS OF METAL FOR CARBON.
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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |