US3556821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porcelain enamel for hot water tanks
Assignee: Eagle Picher Industries Inc
•
Filing: 1968-11-18
•
Granted: 1971-01-19
•
Expires: 1988-11-18
Abstract
Abstract PORCELAIN ENAMEL COMPOSITION PARTICULARLY SUITED FOR USE IN LINING HOT WATER TANKS, THE COMPOSITION CONTAINING CONTROLLED AMOUNTS OF SILICON DIOXIDE, TITANIUM DIOXIDE, BORIC OXIDE, SODIUM OXIDE, LITHIUM OXIDE, CALCIUM OXIDE, COBALT OXIDE, MANGANESE OXIDE, FLUORINE, AND OPTIONALLY ZIRCOTIA, POTASSIUM OXIDE AND NICKEL OXIDE, THE PRECENTAGES OF THE BORIC OXIDE, MANAGANESE OXIDE, FLUORINE, ZIRCONIA, AND MANGANESE OXIDE BEING CONTROLLED TO PRODUCE AN ENAMEL COATING WHICH HAS EXCELLENT CHEMICAL DURABILITY, ADHERENCE AND FREEDOM FROM DEFECTS.
Inventors
- 👤 Alvin S Hanzlik
- 👤 Otto C Linhart
- 👤 Marvin D Putze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:16
CPC Classifications
C; C03; C03C; C03C4/00; C03C10/00; C03C10/16; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112; C03C3/115; C23; C23D; C23D5/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |