US2726181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heat treating cartridge cases
Assignee: Individual
•
Filing: 1951-10-26
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Granted: 1955-12-06
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Expires: 1971-10-26
Abstract
No abstract record available.
Inventors
- 👤 Lyon George Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:09
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
IN A METHOD OF HEAT TREATING A CASE HAVING A RELATIVELY THICK HEAD END AND A RELATIVELY THIN SIDE WALL, BOTH THE HEAD END AND WALL HAVING BEEN INTEGRALLY FORMED FROM A COLD WORKED BLANK OF STEEL OF 0.25 TO 0.40% CARBON CONTENT, THE STEPS WHICH COMPRISES IMMERSING SAID CASE HEAD END FIRST INTO A HEAT TREATING ATMOSPHERE HAVING A TEMPERATURE BETWEEN 1250* AND 1650* F., AUGMENTING THE EFFECTIVE MASS OF THE HEAD END AND CONTROLLING THE TIME AND CONDITIONS OF IMMERSION OF SAID HEAD END AND PORTIONS OF SAID SIDE WALL CONTIGUOUS THERETO TO BRING THE HEAD END TO A TEMPERATURE WITHIN THE LOWER PORTION ONLY OF THE CRITIAL RANGE OF SAID STEEL WHILE BRINGING THE THIN SIDE WALL PORTIONS TO A TEMPERATURE OF AROUND THE UPPER CRITICAL POINT OF SAID STEEL, AND QUENCHING THE HEATED HEAD END AND WALL PORTIONS, WHEREBY A PARTIAL ANNEALING OF THE STEEL OF SAID HEAD END AND A HARDENING OF THE STEEL OF SAID SIDE WALL PORTIONS ARE EFFECTED
Claim 2
Dependent Claim
166 words
IN A METHOD OF HEAT TREATING A CASE HAVING A RELATIVELY THICK HEAD END AND A RELATIVELY THIN SIDE WALL, BOTH THE HEAD END AND WALL HAVING BEEN INTEGRALLY FORMED FROM A COLD WORKED BLANK OF STEEL OF 0.25 TO 0.40% CARBON CONTENT, THE STEPS WHICH COMPRISES IMMERSING SAID CASE HEAD END FIRST INTO A HEAT TREATING ATMOSPHERE HAVING A TEMPERATURE BETWEEN 1250* AND 1650* F., AUGMENTING THE EFFECTIVE MASS OF THE HEAD END AND CONTROLLING THE TIME AND CONDITIONS OF IMMERSION OF SAID HEAD END AND PORTIONS OF SAID SIDE WALL CONTIGUOUS THERETO TO BRING THE HEAD END TO A TEMPERATURE WITHIN THE LOWER PORTION ONLY OF THE CRITIAL RANGE OF SAID STEEL WHILE BRINGING THE THIN SIDE WALL PORTIONS TO A TEMPERATURE OF AROUND THE UPPER CRITICAL POINT OF SAID STEEL, AND QUENCHING THE HEATED HEAD END AND WALL PORTIONS, WHEREBY A PARTIAL ANNEALING OF THE STEEL OF SAID HEAD END AND A HARDENING OF THE STEEL OF SAID SIDE WALL PORTIONS ARE EFFECTED
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) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |