US2946708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitriding with electric glow discharge
Assignee: Elektrophysikalische Anstalt Bernhard Berghaus
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Filing: 1955-09-14
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Granted: 1960-07-26
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Expires: 1975-09-14
Abstract
No abstract record available.
Inventors
- 👤 Berghaus Bernhard
- 👤 Bucek Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:30
CPC Classifications
C; C22; C22B; C22B4/00; C23; C23C; C23C8/00; C23C8/06; C23C8/36; C23C8/38; F; F41; F41A; F41A21/00; F41A21/22; H; H01; H01J; H01J37/00; H01J37/32; H01J37/32009; H01J37/32018; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/903; Y10S422/00; Y10S422/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
PROCESS FOR HARDENING THE INTERIOR SURFACE OF STEEL GUN-BARRELS WHICH COMPRISES SUBJECTING THE PORTION OF THE INTERIOR SURFACE OF A GUN-BARREL WHICH IS CONTACTED BY THE PROJECTILE TO AN ELECTRICAL GLOW-DISCHARGE IN A NITROGENOUS ATMOSPHERE TO EFFECT HEATING OF THE INTERIOR SURFACE OF THE GUN-BARREL, SUBSTANTIALLY ENTIRELY BY SUCH GLOWDISCHARGE, TO A NITRIDING TEMPERATURE AND HEAVY BOMBARDMENT OF SUCH SURFACE, WITH NITROGEN IONS TO ENRICH THE TREATED SURFACE WITH NITROGEN THROUGH THE GLOW-DISCHARGE UNTIL THERE IS OBTAINED A HARDENED INTERIOR SURFACE ZONE CHARACTERIZED BY INCREASED RESISTANCE TO WEAR, AND BY DUCTILITY AND RESISTANCE TO SPLINTERING.
Claim 2
Dependent Claim
95 words
PROCESS FOR HARDENING THE INTERIOR SURFACE OF STEEL GUN-BARRELS WHICH COMPRISES SUBJECTING THE PORTION OF THE INTERIOR SURFACE OF A GUN-BARREL WHICH IS CONTACTED BY THE PROJECTILE TO AN ELECTRICAL GLOW-DISCHARGE IN A NITROGENOUS ATMOSPHERE TO EFFECT HEATING OF THE INTERIOR SURFACE OF THE GUN-BARREL, SUBSTANTIALLY ENTIRELY BY SUCH GLOWDISCHARGE, TO A NITRIDING TEMPERATURE AND HEAVY BOMBARDMENT OF SUCH SURFACE, WITH NITROGEN IONS TO ENRICH THE TREATED SURFACE WITH NITROGEN THROUGH THE GLOW-DISCHARGE UNTIL THERE IS OBTAINED A HARDENED INTERIOR SURFACE ZONE CHARACTERIZED BY INCREASED RESISTANCE TO WEAR, AND BY DUCTILITY AND RESISTANCE TO SPLINTERING.
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) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |