Patent US2990594A successfully refreshed from Google Patents.
US2990594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shell molding composition and process
Assignee: Hercules Powder Co
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Filing: 1955-09-23
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Granted: 1961-07-04
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Expires: 1975-09-23
Abstract
No abstract record available.
Inventors
- 👤 John R Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:25
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A MOLDING COMPOSITION COMPRISING A MAJOR AMOUNT OF SAND AND A MINOR AMOUNT OF A BINDER PREPARED BY BLENDING TOGETHER IN THE MOLTEN STATE A SUBSTANTIALLY PETROLEUM HYDROCARBON-INSOLUBLE PINE WOOD RESIN AND A PHENOLALDEHYDE NOVOLAK RESIN.
Claim 2
Dependent Claim
36 words
A MOLDING COMPOSITION COMPRISING A MAJOR AMOUNT OF SAND AND A MINOR AMOUNT OF A BINDER PREPARED BY BLENDING TOGETHER IN THE MOLTEN STATE A SUBSTANTIALLY PETROLEUM HYDROCARBON-INSOLUBLE PINE WOOD RESIN AND A PHENOLALDEHYDE NOVOLAK RESIN.
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |