Patent US2828218A successfully refreshed from Google Patents.
US2828218A
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Enameling composition and process
Assignee: Fletcher Enamel Co
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Filing: 1954-02-10
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Granted: 1958-03-25
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Expires: 1974-02-10
Abstract
No abstract record available.
Inventors
- 👤 Haven M Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:31
CPC Classifications
C; C03; C03C; C03C4/00; C23; C23D; C23D5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR PREPARING THE SURFACE OF A METALLIC BASIS MATERIAL FOR COATING WITH A PORCELAIN ENAMEL COVER COAT COMPRISING: APPLYING TO THE METALLIC SURFACE A COATING LAYER OF A FLINT-FELDSPAR-BORAX CONTAINING TYPE OF ENAMELING COMPOSITION OF A WEIGHT, PER SIDE, OF FROM 1/8 TO 3/8 OUNCE PER SQUARE FOOT DRY WEIGHT; AND FIRING THE METALLIC BASIS MATERIAL FOR FROM 3 MINUTES TO 8 MINUTES AT A TEMPERATURE OF FROM 1300*F. TO 1700*F. TO FORM A MATLIKE GROUND COAT.
Claim 2
Dependent Claim
79 words
A PROCESS FOR PREPARING THE SURFACE OF A METALLIC BASIS MATERIAL FOR COATING WITH A PORCELAIN ENAMEL COVER COAT COMPRISING: APPLYING TO THE METALLIC SURFACE A COATING LAYER OF A FLINT-FELDSPAR-BORAX CONTAINING TYPE OF ENAMELING COMPOSITION OF A WEIGHT, PER SIDE, OF FROM 1/8 TO 3/8 OUNCE PER SQUARE FOOT DRY WEIGHT; AND FIRING THE METALLIC BASIS MATERIAL FOR FROM 3 MINUTES TO 8 MINUTES AT A TEMPERATURE OF FROM 1300*F. TO 1700*F. TO FORM A MATLIKE GROUND COAT.
References Cited (Backward Citations)
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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) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |