US3929443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for curing fissures and the like of workpieces formed of metal oxide materials and processed under high material stress
Assignee: Lasag AG
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Filing: 1974-06-17
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Granted: 1975-12-30
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Expires: 1994-06-17
Abstract
Abstract A method for curing fissures and cracks or the like at workpieces formed of metal oxide materials and processed under high material stress, wherein the workpieces are heated in a furnace to a temperature in the range of 1000* to 1600*C.
Inventors
- 👤 Hans-Ulrich Leuenberger
- 👤 Reiner Stemme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:49
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C03; C03B; C03B32/00; G; G04; G04D; G04D3/00; G04D3/0069; G04D3/0071; G04D3/0074; G04D3/0094
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
IN A METHOD OF TREATING MACHINED WORKPIECES OF RUBIES, SAPPHIRES AND SINTERED METAL OXIDES WHEREIN FISSURES ARE PRESENT IN THE WORKPIECES AS A RESULT OF THE MACHINING OPERATION, THE IMPROVEMENT COMPRISIG THE STEPS OF: PROVIDING A WORKPIECE HAVING FISSURES PRESENT THEREIN AS A RESULT OF THE MACHINING OPERATION; AND CURING THE FISSURES BY HEATING THE WORKPIECE IN A FURNACE TO A TEMPERATURE RANGING FROM ABOUT 1200* TO 1600*C FOR A TIME WHICH IS EFFECTIVE IN REDUCING THE MAGNITUDE OF THE FUSSIRES WHEREBY THE DANGER OF RUPTURE OF THE WORKPIECE BY SAID FUSSURES IS LESSENED.
Claim 2
Dependent Claim
94 words
IN A METHOD OF TREATING MACHINED WORKPIECES OF RUBIES, SAPPHIRES AND SINTERED METAL OXIDES WHEREIN FISSURES ARE PRESENT IN THE WORKPIECES AS A RESULT OF THE MACHINING OPERATION, THE IMPROVEMENT COMPRISIG THE STEPS OF: PROVIDING A WORKPIECE HAVING FISSURES PRESENT THEREIN AS A RESULT OF THE MACHINING OPERATION; AND CURING THE FISSURES BY HEATING THE WORKPIECE IN A FURNACE TO A TEMPERATURE RANGING FROM ABOUT 1200* TO 1600*C FOR A TIME WHICH IS EFFECTIVE IN REDUCING THE MAGNITUDE OF THE FUSSIRES WHEREBY THE DANGER OF RUPTURE OF THE WORKPIECE BY SAID FUSSURES IS LESSENED.
Claim 3
Dependent Claim
26 words
The method as defined in claim 1, including the step of maintaining the workpiece in said temperature range during a period of 12 to 48 hours.
Claim 4
Dependent Claim
21 words
The method as defined in claim 2, including the step of thereafter subjecting the workpiece in the furnace to natural cooling.
Claim 5
Dependent Claim
34 words
The method as defined in claim 2, including the step of cooling the workpiece in steps of 50*C per hour down to 800*C and thereafter subjecting the workpiece to normal cooling in the furnace.
Claim 6
Dependent Claim
15 words
The method as defined in claim 1, wherein the workpiece is a watch bearing jewel.
Claim 7
Dependent Claim
23 words
The method as defined in claim 5, wherein said watch bearing jewel is formed of ruby and bored by means of laser energy.
References Cited (Backward Citations)
US1814219A
Cited
US3352655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |