Patent US4002784A successfully refreshed from Google Patents.
US4002784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating method for graphite
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-11-06
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Granted: 1977-01-11
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Expires: 1995-11-06
Abstract
Abstract A method of limiting carbon contamination from graphite ware used in induction melting of uranium alloys is provided comprising coating the graphite surface with a suspension of Y2O3 particles in water containing about 1.5 to 4% by weight sodium carboxymethylcellulose.
Inventors
- 👤 John G. Banker
- 👤 Cressie E. Holcombe, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:20
CPC Classifications
B; B22; B22C; B22C3/00; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
A method of limiting adverse carbon contamination in metals from graphite ware used in melting said metals, comprising coating said graphite ware with a suspension comprising Y 2 O 3 in a suspending solution consisting of water and an effective suspending amount of sodium carboxymethylcellulose.
Claim 2
Independent Claim
45 words
A method of limiting adverse carbon contamination in metals from graphite ware used in melting said metals, comprising coating said graphite ware with a suspension comprising Y 2 O 3 in a suspending solution consisting of water and an effective suspending amount of sodium carboxymethylcellulose.
Claim 3
Dependent Claim
57 words
The method of claim 1 wherein said coating step is carried out by applying a first coat comprising 45-60 grams Y 2 O 3 per 100 grams of said suspending solution, allowing said first coat to dry, and then applying a second coat comprising 90-110 grams of Y 2 O 3 per 100 grams of suspending solution.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said suspending solution consists of water and 1.5-4% by weight sodium carboxymethylcellulose.
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) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |