Patent US3838288A successfully refreshed from Google Patents.
US3838288A
Expired / Lapsed
US
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Method for the remelt treatment of workpieces and the like
Assignee: Messer Griesheim GmbH
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Filing: 1973-02-22
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Granted: 1974-09-24
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Expires: 1993-02-22
Abstract
Abstract A method for the remelt treatment of workpieces, machine parts and the like comprises the application of energy by means of a controlled energy beam to the remelt region in two successive steps to avoid formation of pores. In the first remelting step, the material within the remelt region is melted and allowed to solidify, and is then again remelted in a second step in which the impingement of energy is controlled to remelt only the region of material previously remelted and solidified.
Inventors
- 👤 H Stolz
- 👤 J Koy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:42
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/16; C22B9/22; C22B9/228; C22B9/221; C22B9/223
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A method for the remelt treatment of selected surface regions of workpieces by means of a controllable beam of radiant energy which comprises as a first step applying the beam thereto to remelt the material within the said surface regions, allowing the remelted material to solidify, and then as a second step again applying the beam thereto to remelt again the said previously solidified material within the said surface regions while controlling the impingement of said radiant energy to remelt again only said previously remelted and solidified material within the said surface regions to thereby prevent the formation of pores within the treated regions of the material.
Claim 2
Independent Claim
107 words
A method for the remelt treatment of selected surface regions of workpieces by means of a controllable beam of radiant energy which comprises as a first step applying the beam thereto to remelt the material within the said surface regions, allowing the remelted material to solidify, and then as a second step again applying the beam thereto to remelt again the said previously solidified material within the said surface regions while controlling the impingement of said radiant energy to remelt again only said previously remelted and solidified material within the said surface regions to thereby prevent the formation of pores within the treated regions of the material.
Claim 3
Dependent Claim
44 words
The method according to claim 1 in which the impingement of said radiant energy applied by said beam to remelt again said previously melted and solidified material is controlled to fail to reach the perimeters of the previously remelted material within said surface regions.
Claim 4
Dependent Claim
38 words
The method according to claim 1 in which the application of said radiant energy by the beam during said second step is controlled as a function of the temperature of said previously solidifed material within said surface regions.
Claim 5
Dependent Claim
26 words
The method according to claim 1 in which the second remelting step is carried out immediately after solidification of the material remelted by said first step.
Claim 6
Dependent Claim
31 words
The method according to claim 1 in which the second remelting step is carried out within a given period of delay after solidification of the material remelted by said first step.
Claim 7
Dependent Claim
14 words
The method according to claim 1 in which the material treated is cast iron.
Claim 8
Dependent Claim
19 words
The method according to claim 1 in which the articles treated are structural parts of a rotary piston engine.
Claim 9
Dependent Claim
22 words
The method according to claim 1 in which the articles treated are valve seats of the cylinder heads of internal combustion engines.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |