US3055779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making enameled ductile iron
Assignee: Pfaudler Permutit Inc
•
Filing: 1959-03-16
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Granted: 1962-09-25
•
Expires: 1979-03-16
Abstract
No abstract record available.
Inventors
- 👤 Gordon P K Chu
- 👤 Werner C Helwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:18
CPC Classifications
C; C23; C23D; C23D3/00; C21; C21D; C21D5/00; C21D5/04; C21D5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
THE METHOD OF PRODUCING DUCTILE CAST IRON ARTICLES HAVING A VITREOUS ENAMEL COATING, COMPRISING THE METHED STEPS OF HEATING SAID IRON ARTICLES IN A DECARBURIZING ATMOSPHERE FOR REMOVING THE CARABON FROM THE SURFACE LAYER THEREOF, MAINTAINING SAID ARTICLE AT A TEMPERATURE SUFFICIENTLY ELEVATED TO DECOMPOSE THE CARBON COMPOUNDS IN THE BODY OF SAID ARTICLES FOR STABILIZING THE CARABON IN THE FORM OF GRAPHITIC NODULES, COOLING SAID ARTICLE, APPLYING A COATING OF ENAMEL FRIT TO SAID ARTICLE, AND HEATING SAID ARTICLE FOR FUSING SAID ENAMEL ON THE SURFACE THEREOF.
Claim 2
Independent Claim
88 words
THE METHOD OF PRODUCING DUCTILE CAST IRON ARTICLES HAVING A VITREOUS ENAMEL COATING, COMPRISING THE METHED STEPS OF HEATING SAID IRON ARTICLES IN A DECARBURIZING ATMOSPHERE FOR REMOVING THE CARABON FROM THE SURFACE LAYER THEREOF, MAINTAINING SAID ARTICLE AT A TEMPERATURE SUFFICIENTLY ELEVATED TO DECOMPOSE THE CARBON COMPOUNDS IN THE BODY OF SAID ARTICLES FOR STABILIZING THE CARABON IN THE FORM OF GRAPHITIC NODULES, COOLING SAID ARTICLE, APPLYING A COATING OF ENAMEL FRIT TO SAID ARTICLE, AND HEATING SAID ARTICLE FOR FUSING SAID ENAMEL ON THE SURFACE THEREOF.
References Cited (Backward Citations)
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Cited
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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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |