Patent US3838982A successfully refreshed from Google Patents.
US3838982A
Expired / Lapsed
US
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Impervious sintered iron-copper metal object
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1973-02-21
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Granted: 1974-10-01
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Expires: 1993-02-21
Abstract
Abstract A metallic object formed of metal particles compressed together to form a rigid object. Each of the metal particles is coated with a metal having a melting temperature lower than that of the metal of the particles. The coating metal fills the voids between the particles so that the object is impervious to fluids.
Inventors
- 👤 H Sanderow
- 👤 K Merz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:54
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; B; B22; B22F; B22F1/00; B22F1/17; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12181
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
AN IMPERVIOUS METAL BODY COMPRISING A PLURALITY OF IRON POWDER PARTICLES BONDED TOGETHER, EACH OS SAID PARTICLES BEING COATED WITH A LAYER OF COPPER, WITH THE COPPER LAYER SUBSTANTIALLY FILLING THE SPACES BETWEEN THE PARTICLES SO THAT THE BODY IS IMPERVIOUS, THE BODY INCLUDING FROM ABOUT 12% TO ABOUT 30% BY WEIGHT OF COPPER.
Claim 2
Dependent Claim
54 words
AN IMPERVIOUS METAL BODY COMPRISING A PLURALITY OF IRON POWDER PARTICLES BONDED TOGETHER, EACH OS SAID PARTICLES BEING COATED WITH A LAYER OF COPPER, WITH THE COPPER LAYER SUBSTANTIALLY FILLING THE SPACES BETWEEN THE PARTICLES SO THAT THE BODY IS IMPERVIOUS, THE BODY INCLUDING FROM ABOUT 12% TO ABOUT 30% BY WEIGHT OF COPPER.
Claim 3
Dependent Claim
23 words
A metal body in accordance with claim 1 in which the body includes between 12 percent and 16 percent by weight of copper.
Claim 4
Dependent Claim
18 words
A metal body in accordance with claim 1 including carbon dispersed in the iron particles of the body.
Claim 5
Dependent Claim
27 words
A metal body in accordance with claim 3 including between 0.5 percent and 1.0 percent by weight of carbon dispersed in the iron particles of the body.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |