Patent US4541867A successfully refreshed from Google Patents.
US4541867A
Expired / Lapsed
US
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Varnish-bonded carbon-coated magnesium and aluminum granules
Assignee: AMAX MAGNESIUM Corp A CORP OF
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Filing: 1984-03-20
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Granted: 1985-09-17
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Expires: 2004-03-20
Abstract
Abstract Varnish-bonded, carbon-coated metal granules are provided, the metal granules being preferably selected from the group consisting of magnesium, aluminum and alloys thereof. The coating may optionally contain at least one calcium compound, e.g., at least one calcium compound selected from the group consisting of CaO, CaCO 3 , CaC 2 , CaSiO 3 , CaSi 2 , CaAl 2 O 4 , portland cement and CaF 2 .
Inventors
- 👤 Ramaswami Neelameggham
- 👤 Hedayat Abedi
- 👤 John C. Priscu
- 👤 Michael H. Legge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:49
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02; C21C1/025; C21C1/10; C21C1/105; C21C7/00; C21C7/0006; C21C7/04; C21C7/06; C21C7/064; C21C7/0645; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
An addition agent for treating molten metals comprising, coated granules of a metal selected from the group consisting of magnesium, aluminum and alloys thereof of size ranging from of about 30 to 150 mesh (U.S. Standard), said coating characterized by a varnish-bonded, carbon-containing layer produced from a polymerizable oil thermally polymerized to a varnish and then partially carbonized by thermal decomposition, said coated granules being further characterized by being free flowing, substantially non-hygroscopic and exhibiting reduced pyrophoricity.
Claim 2
Dependent Claim
77 words
An addition agent for treating molten metals comprising, coated granules of a metal selected from the group consisting of magnesium, aluminum and alloys thereof of size ranging from of about 30 to 150 mesh (U.S. Standard), said coating characterized by a varnish-bonded, carbon-containing layer produced from a polymerizable oil thermally polymerized to a varnish and then partially carbonized by thermal decomposition, said coated granules being further characterized by being free flowing, substantially non-hygroscopic and exhibiting reduced pyrophoricity.
Claim 3
Dependent Claim
23 words
The addition agent of claim 1, wherein the varnish-bonded carbon coating contains a dispersion of fine particles of at least one calcium compound.
Claim 4
Dependent Claim
44 words
The addition agent of claim 2, wherein the calcium compound is at least one selected from the group consisting of CaO, CaCO 3 , CaC 2 , CaSiO 3 , CaSi 2 , CaAl 2 O 4 , portland cement and CaF 2 .
Claim 5
Dependent Claim
14 words
The addition agent of claim 1, wherein the metal granules are made of magnesium.
Claim 6
Dependent Claim
14 words
The addition agent of claim 1, wherein the metal granules are made of aluminum.
Claim 7
Dependent Claim
79 words
An addition agent for treating molten metals comprising, coated granules of a metal selected from the group consisting of magnesium, aluminum and alloys thereof, said coating characterized by a varnish-bonded, carbon-containing layer produced from a polymerizable oil thermally polymerized to a varnish and then partially carbonized by thermal decomposition, said coating containing a dispersion of fine particles of at least one calcium compound, said coated granules being further characterized by being free flowing, substantially non-hygroscopic and exhibiting reduced pyrophoricity.
Claim 8
Dependent Claim
79 words
An addition agent for treating molten metals comprising, coated granules of a metal selected from the group consisting of magnesium, aluminum and alloys thereof, said coating characterized by a varnish-bonded, carbon-containing layer produced from a polymerizable oil thermally polymerized to a varnish and then partially carbonized by thermal decomposition, said coating containing a dispersion of fine particles of at least one calcium compound, said coated granules being further characterized by being free flowing, substantially non-hygroscopic and exhibiting reduced pyrophoricity.
Claim 9
Dependent Claim
44 words
The addition agent of claim 6, wherein the calcium compound is at least one selected from the group consisting of CaO, CaCO 3 , CaC 2 , CaSiO 3 , CaSi 2 , CaAl 2 O 4 , portland cement and CaF 2 .
Claim 10
Dependent Claim
14 words
The addition agent of claim 6, wherein the metal granules are made of magnesium.
Claim 11
Dependent Claim
14 words
The addition agent of claim 6, wherein the metal granules are made of aluminum.
References Cited (Backward Citations)
US4019897A
Cited
US4083716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |