US2669008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing tungsten articles of predetermined shape and dimensions
Assignee: Philips Laboratories Inc
•
Filing: 1951-06-30
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Granted: 1954-02-16
•
Expires: 1971-06-30
Abstract
No abstract record available.
Inventors
- 👤 Levi Roberto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:23
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1121; B22F3/1134; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/49812; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T82/00; Y10T82/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A METHOD OF MANUFACTURING A MACHINED TUNGSTEN BODY OF DESIRED SHAPE AND DIMENSIONS WITH THE USE OF A FILLER METAL SELECTED FROM THE GROUP CONSISTING OF COPPER, GOLD, SILVER AND ALLOYS BETWEEN THOSE METALS IN ANY PROPORTIONS COMPRISING THE STEPS OF PRESSING A MASS OF TUNGSTEN PARTICLES INTO A BODY HEATING THE PRESSED TUNG STEN BODY AT A SINTERING TEMPERATURE HIGHER THAN 1000* C. AND SUBSTANTIALLY HIGHER THAN THE TEMPERATURE AT WHICH SAID FILLER METAL IS SUBSEQUENTLY EVAPORATED TO THEREBY FORM AN UNMACHINABLE SINTERED POROUS BODY, IMPREGNATING THE POROUS BODY WITH THE MOLTEN FILLER METAL THE TUNGSTEN PORTION OF SAID BODY BEING SUBSTANTIALLY IN ITS FINAL SINTERED STATE, MACHINING THE IMPREGNATED BODY TO REMOVE PORTIONS THEREFROM AND OBTAIN THE BODY OF DESIRED SHAPE AND DIMENSIONS, AND EVAPORATING SAID FILLER METAL FROM SAID BODY IN A SUBSTANTIALLY NON-OXIDIZING ATMOSPHERE AND AT A TEMPERATURE SUBSTANTIALLY LESS THAN SAID SINTERING TEMPERATURE WITHOUT APPRECIABLY CHANGING THE DIMENSIONS THEREOF.
Claim 2
Independent Claim
154 words
A METHOD OF MANUFACTURING A MACHINED TUNGSTEN BODY OF DESIRED SHAPE AND DIMENSIONS WITH THE USE OF A FILLER METAL SELECTED FROM THE GROUP CONSISTING OF COPPER, GOLD, SILVER AND ALLOYS BETWEEN THOSE METALS IN ANY PROPORTIONS COMPRISING THE STEPS OF PRESSING A MASS OF TUNGSTEN PARTICLES INTO A BODY HEATING THE PRESSED TUNG STEN BODY AT A SINTERING TEMPERATURE HIGHER THAN 1000* C. AND SUBSTANTIALLY HIGHER THAN THE TEMPERATURE AT WHICH SAID FILLER METAL IS SUBSEQUENTLY EVAPORATED TO THEREBY FORM AN UNMACHINABLE SINTERED POROUS BODY, IMPREGNATING THE POROUS BODY WITH THE MOLTEN FILLER METAL THE TUNGSTEN PORTION OF SAID BODY BEING SUBSTANTIALLY IN ITS FINAL SINTERED STATE, MACHINING THE IMPREGNATED BODY TO REMOVE PORTIONS THEREFROM AND OBTAIN THE BODY OF DESIRED SHAPE AND DIMENSIONS, AND EVAPORATING SAID FILLER METAL FROM SAID BODY IN A SUBSTANTIALLY NON-OXIDIZING ATMOSPHERE AND AT A TEMPERATURE SUBSTANTIALLY LESS THAN SAID SINTERING TEMPERATURE WITHOUT APPRECIABLY CHANGING THE DIMENSIONS THEREOF.
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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) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |