Patent US2881081A successfully refreshed from Google Patents.
US2881081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory binder for metal casting molds
Assignee: Individual
•
Filing: 1954-06-02
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Granted: 1959-04-07
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Expires: 1974-06-02
Abstract
No abstract record available.
Inventors
- 👤 John A Henricks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:38
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/186; B22C1/183; B22C1/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A BINDER FOR REFRACTORY POWDERS COMPRISING COLLOIDAL SILICA FORMED BY NEUTRALIZING THE ALKALI OF AN AQUEOUS SODIUM SILICATE SOLUTION WITH SUFFICIENT PHOSPHORIC ACID TO PEPTIZE THE COLLODIAL SILICA AT A PH BELOW 2.0.
Claim 2
Dependent Claim
33 words
A BINDER FOR REFRACTORY POWDERS COMPRISING COLLOIDAL SILICA FORMED BY NEUTRALIZING THE ALKALI OF AN AQUEOUS SODIUM SILICATE SOLUTION WITH SUFFICIENT PHOSPHORIC ACID TO PEPTIZE THE COLLODIAL SILICA AT A PH BELOW 2.0.
References Cited (Backward Citations)
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US2152152A
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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) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |