US3709849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold-set process for the production of phenolic novolak resinous foundry cores
Assignee: Hexion Inc
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Filing: 1969-12-03
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Granted: 1973-01-09
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Expires: 1989-12-03
Abstract
Abstract THIS INVENTION RELATES TO FOUNDRY CORES HAVING HIGH STRENGTHS PREPARED BY A COLD-SER PROCESS EMPLOYING A FIRST GRANULAR MATERIAL COATED WITH A LIQUID COMPOSITION COMPRISING A METHYLOLATED PRODUCT IN CONJUNCTION WITH A SECOND GRANULAR REFRACTORY MATERIAL IN CONJUNCTION WITH A SECCOMPRISING AN ACIDIC MATERIAL AND A SUSPENSION OR SOLUTION OF PHENOLIC NOVOLAK RESIN.
Inventors
- 👤 P Lemon
- 👤 C Terron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:19
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233
Claims Analysis
Total Claims: 0
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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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |