Patent US3900940A successfully refreshed from Google Patents.
US3900940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of impregnating a sintered porous metal article to make the article liquid-tight
Assignee: Impco Inc
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Filing: 1974-03-20
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Granted: 1975-08-26
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Expires: 1994-03-20
Abstract
Abstract An article having a compacted powdered metal body of a desired configuration which is sintered to approximately 75% - 94% theoretical density with some voids therein and the voids are filled with a liquid organic polymerizable impregnant applied under pressure and cured under pressure to prevent any voids in the impregnant.
Inventors
- 👤 Jr Peter T E Gebhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:52
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/24; B22F3/26; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T29/49986; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
IN THE METHOD OF SEALING A SINTERED METAL ARTICLE TO MAKE THE ARTICLE LIQUID-TIGHT UNDER PRESSURE COMPRISING COMPASTING POWDERED METAL TO THE CONFIGURATION OF BODY DESIRED AND SINTERING THE BODY TO APPROXIMATELY 75-94 PERCENT OF THEORETICAL DENSITY WITH SOME VOIDS THEREIN, SUBJECTING THE BODY TO A PARTIAL VACUUM TO DRAW GASES FROM THE VOILDS THEREIN, IMMERSING THE BODY IN A LIQUID ORGANIC POLYMERIZABLE IMPREGNANT AND APPLYING PRESSURE TO SAID IMPREGNANT TO FORCE IT INTO THE VOIDS IN THE BODY, REMOVING THE BODY FROM THE LIQUID IMPREGNANT AND CURING THE IMPREGNATED BODY BY IMMERSION IN A HOT LIQUID BATH WHICH IS INERT TO THE ARTICLE AND TO THE IMPREGNANT AND CAPABLE OF TRANSMITTING HEAT AND PRESSURE TO THE IMPREGNATED ARTICLE, SAID CURING BATH BEING KEPT AT A TEMPERATURE OF 265*285*F. WITH AN ADDED PRESSURE OF FROM 10 TO 100 POUNDS PER SQUARE INCH FOR SUCH PERIOD OF TIME UNTIL SAID IMPREGNANT POLYMERIZES AND BECOMES SOLID WHEREBY TO PREVENT ITS GASING AND FORMING VOIDS IN THE SOLID IMPREGNANT.
Claim 2
Dependent Claim
166 words
IN THE METHOD OF SEALING A SINTERED METAL ARTICLE TO MAKE THE ARTICLE LIQUID-TIGHT UNDER PRESSURE COMPRISING COMPASTING POWDERED METAL TO THE CONFIGURATION OF BODY DESIRED AND SINTERING THE BODY TO APPROXIMATELY 75-94 PERCENT OF THEORETICAL DENSITY WITH SOME VOIDS THEREIN, SUBJECTING THE BODY TO A PARTIAL VACUUM TO DRAW GASES FROM THE VOILDS THEREIN, IMMERSING THE BODY IN A LIQUID ORGANIC POLYMERIZABLE IMPREGNANT AND APPLYING PRESSURE TO SAID IMPREGNANT TO FORCE IT INTO THE VOIDS IN THE BODY, REMOVING THE BODY FROM THE LIQUID IMPREGNANT AND CURING THE IMPREGNATED BODY BY IMMERSION IN A HOT LIQUID BATH WHICH IS INERT TO THE ARTICLE AND TO THE IMPREGNANT AND CAPABLE OF TRANSMITTING HEAT AND PRESSURE TO THE IMPREGNATED ARTICLE, SAID CURING BATH BEING KEPT AT A TEMPERATURE OF 265*285*F. WITH AN ADDED PRESSURE OF FROM 10 TO 100 POUNDS PER SQUARE INCH FOR SUCH PERIOD OF TIME UNTIL SAID IMPREGNANT POLYMERIZES AND BECOMES SOLID WHEREBY TO PREVENT ITS GASING AND FORMING VOIDS IN THE SOLID IMPREGNANT.
Claim 3
Dependent Claim
33 words
The method of sealing a sintered article as in claim 1 wherein the article is subjected to the curing fluid from 40 to 60 minutes at a pressure of 25 to 100 pounds.
Claim 4
Dependent Claim
31 words
The method of sealing a sintered article as in claim 1 wherein the article is subjected to the curing fluid for 50 minutes at a pressure of 25 to 100 pounds.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |