Patent US3726867A successfully refreshed from Google Patents.
US3726867A
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US
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Foundry process and articles produced thereby
Assignee: Ashland LLC
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Filing: 1971-03-15
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Granted: 1973-04-10
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Expires: 1991-03-15
Abstract
Abstract SHAPED FOUNDRY ARTICLES ARE PRODUCED BY A PROCESS IN WHICH A PHENOLIC RESIN CONTAINING AN IONIC CATALYST IS ADMIXED WITH A POLYISOCYANATE AND A FOUNDRY AGGREGATE AND THEN SHAPED AND CURED AT ROOM TEMPERATURE.
Inventors
- 👤 J Robins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:06
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; B22C1/2273; B22C9/00; B22C9/10; B22C9/12; C08G18/18; C08G18/1891; C08G18/28; C08G18/40; C08G18/54; C08G18/542; C08G8/00; C08G8/04; C08G8/08
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |