US3228778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass furnace lining
Assignee: Harbison Walker Refractories Co
•
Filing: 1964-04-08
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Granted: 1966-01-11
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Expires: 1984-04-08
Abstract
No abstract record available.
Inventors
- 👤 Frank H Walther
- 👤 Joseph R Ryan
- 👤 Thomas W Smoot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:41
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/42; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/484; C04B35/622; C04B35/653; C04B35/657
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A REFRACTORY SHAPE CONSISTING ESSENTIALLY OF, BY WEIGHT, 1 TO 5% OF ZIRCON, 0.5 TO 1.5% OF TITANIA, 0.05 TO 0.1% OF BORIC ACID AND THE BALANCE STABILIZED ZIRCONIA, THE SHAPE BEING CHARACTERIZED BY HAVING A SUBSTANTIALLY ZERO OUTER SURFACE POROSITY.
Claim 2
Dependent Claim
41 words
A REFRACTORY SHAPE CONSISTING ESSENTIALLY OF, BY WEIGHT, 1 TO 5% OF ZIRCON, 0.5 TO 1.5% OF TITANIA, 0.05 TO 0.1% OF BORIC ACID AND THE BALANCE STABILIZED ZIRCONIA, THE SHAPE BEING CHARACTERIZED BY HAVING A SUBSTANTIALLY ZERO OUTER SURFACE POROSITY.
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |