Patent US2955336A successfully refreshed from Google Patents.
US2955336A
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Shell molding sand and the process of making and using the same
Assignee: American Marietta Co
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Filing: 1956-08-06
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Granted: 1960-10-11
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Expires: 1976-08-06
Abstract
No abstract record available.
Inventors
- 👤 John S Horn
- 👤 Julius M Bleuenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:01
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A FREE-FLOWING RESIN-COATED SHELL MOLDING SAND CONSISTING ESSENTAILLY OF SAND PARTICLES AS CORE MATERIAL SURROUNDED BY A SURFACE LAYER OF ONE-STEP, ALKALINE CATALYZED PHENOL-ADLEHYDE RESING HAVING A MOL RATION OF ALDEHYDE TO PHENOL IN THE RANGE BETWEEN ABOUT 1.1:1 AND ABOUT 2:1 IN A THERMOPLASTIC STAGE OF POLYMERIZATION AND HAVING UNIFORMLY DISTRIBUTED IN SAID SURFACE LAYER FROM ABOUT 2% TO ABOUT 25% OF SUBSTANTIALLY UNREACTED HEXAMETHYLENE TETRAMINE.
Claim 2
Dependent Claim
67 words
A FREE-FLOWING RESIN-COATED SHELL MOLDING SAND CONSISTING ESSENTAILLY OF SAND PARTICLES AS CORE MATERIAL SURROUNDED BY A SURFACE LAYER OF ONE-STEP, ALKALINE CATALYZED PHENOL-ADLEHYDE RESING HAVING A MOL RATION OF ALDEHYDE TO PHENOL IN THE RANGE BETWEEN ABOUT 1.1:1 AND ABOUT 2:1 IN A THERMOPLASTIC STAGE OF POLYMERIZATION AND HAVING UNIFORMLY DISTRIBUTED IN SAID SURFACE LAYER FROM ABOUT 2% TO ABOUT 25% OF SUBSTANTIALLY UNREACTED HEXAMETHYLENE TETRAMINE.
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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) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |