Patent US3190772A successfully refreshed from Google Patents.
US3190772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hardening work in an electric glow discharge
Assignee: Individual
•
Filing: 1961-02-10
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Granted: 1965-06-22
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Expires: 1981-02-10
Abstract
No abstract record available.
Inventors
- 👤 Berghaus Bernhard
- 👤 Bucek Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/32; H01J37/32009; H01J37/32018; C; C21; C21D; C21D1/00; C21D1/34; C21D1/38; C23; C23C; C23C8/00; C23C8/06; C23C8/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD OF TREATING METALLIC WORK PIECES AT AN ELEVATED TEMPERATURE BY MEANS OF AN ELECTRIC GLOW DISCHARGE, COMPRISING THE STEPS OF: PLACING SAID WORK PIECES IN AN IONIZED GAS AT SUBATMOSPHERIC PRESSURE; SUBSTANTIALLY SURROUNDING SAID WORK PIECES WITH AT LEAST ONE ELECTRODE; CREATING A FIRST HIGH-ENERGY ELECTRIC GLOW DISCHARGE ON SAID ELECTRODE TO HEAT THE SAME WHEREBY ONLY A PART OF THE HEAT ENERGY NECESSARY FOR CREATING SAID ELEVATED TEMPERATURE IS RADIATED TO SAID WORK PIECES; AND CREATING A LOWENERGY ELECTRIC GLOW DISCHARGE ON THOSE SURFACES OF SAID WORK PIECES WHICH ARE TO BE TREATED TO PRODUCE ION BOMBARDMENT, PENETRATION THEREOF AND THE REMAINDER OF THE HEAT ENERGY NECESSARY FOR CREATING SAID ELEVATED TEMPERATURE.
Claim 2
Independent Claim
115 words
A METHOD OF TREATING METALLIC WORK PIECES AT AN ELEVATED TEMPERATURE BY MEANS OF AN ELECTRIC GLOW DISCHARGE, COMPRISING THE STEPS OF: PLACING SAID WORK PIECES IN AN IONIZED GAS AT SUBATMOSPHERIC PRESSURE; SUBSTANTIALLY SURROUNDING SAID WORK PIECES WITH AT LEAST ONE ELECTRODE; CREATING A FIRST HIGH-ENERGY ELECTRIC GLOW DISCHARGE ON SAID ELECTRODE TO HEAT THE SAME WHEREBY ONLY A PART OF THE HEAT ENERGY NECESSARY FOR CREATING SAID ELEVATED TEMPERATURE IS RADIATED TO SAID WORK PIECES; AND CREATING A LOWENERGY ELECTRIC GLOW DISCHARGE ON THOSE SURFACES OF SAID WORK PIECES WHICH ARE TO BE TREATED TO PRODUCE ION BOMBARDMENT, PENETRATION THEREOF AND THE REMAINDER OF THE HEAT ENERGY NECESSARY FOR CREATING SAID ELEVATED TEMPERATURE.
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) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |