Patent US2618032A successfully refreshed from Google Patents.
US2618032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of molds
Assignee: Alcoa Corp
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Filing: 1949-08-17
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Granted: 1952-11-18
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Expires: 1969-08-17
Abstract
No abstract record available.
Inventors
- 👤 Frederick O Traenkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:32
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/04; B22D11/041; B22C; B22C3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE METHOD OF PROVIDING A SMOOTH, DURABLE, SUBSTANTIALLY NON-POROUS GRAPHITE SURFACE ON A POROUS MOLD BODY HAVING PORES OF 4 TO 40 MICRONS IN SIZE COMPRISING CONTACTING SAID MOLD BODY WITH A SUSPENSION OF COLLOIDAL GRAPHITE IN A LIQUID BOILING BETWEEN 100 AND 500* F., SAID MOLD BODY BEING AT A TEMPERATURE BELOW THE BOILING POINT OF SAID LIQUID AND THE PERIOD OF CONTACT BETWEEN SAID MOLD BODY AND SUSPENSION BEING LONG ENOUGH TO PERMIT PENETRATION OF SAID MOLD BODY BY SAID SUSPENSION, THE PROPORTION OF SAID GRAPHITE TO SAID LIQUID NOT EXCEEDING 15% BY WEIGHT OF THE LIQUID, DRYING SAID TREATED MOLD BODY AT A TEMPERATURE BETWEEN ROOM TEMPERATURE AND 300* F. AND THEREAFTER BAKING SAID DRIED MOLD BODY AT 500 TO 800* F. FOR A PERIOD OF AT LEAST 15 MINUTES.
Claim 2
Independent Claim
133 words
THE METHOD OF PROVIDING A SMOOTH, DURABLE, SUBSTANTIALLY NON-POROUS GRAPHITE SURFACE ON A POROUS MOLD BODY HAVING PORES OF 4 TO 40 MICRONS IN SIZE COMPRISING CONTACTING SAID MOLD BODY WITH A SUSPENSION OF COLLOIDAL GRAPHITE IN A LIQUID BOILING BETWEEN 100 AND 500* F., SAID MOLD BODY BEING AT A TEMPERATURE BELOW THE BOILING POINT OF SAID LIQUID AND THE PERIOD OF CONTACT BETWEEN SAID MOLD BODY AND SUSPENSION BEING LONG ENOUGH TO PERMIT PENETRATION OF SAID MOLD BODY BY SAID SUSPENSION, THE PROPORTION OF SAID GRAPHITE TO SAID LIQUID NOT EXCEEDING 15% BY WEIGHT OF THE LIQUID, DRYING SAID TREATED MOLD BODY AT A TEMPERATURE BETWEEN ROOM TEMPERATURE AND 300* F. AND THEREAFTER BAKING SAID DRIED MOLD BODY AT 500 TO 800* F. FOR A PERIOD OF AT LEAST 15 MINUTES.
References Cited (Backward Citations)
US928470A
Cited
US1858083A
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US2245747A
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US2241594A
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US2246463A
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US2376518A
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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) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |