Patent US2902256A successfully refreshed from Google Patents.
Patent US3452804A successfully refreshed from Google Patents.
US3452804A
Expired / Lapsed
US
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Method of making a permeable shell mold
Assignee: Individual
•
Filing: 1965-12-02
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Granted: 1969-07-01
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Expires: 1985-12-02
Abstract
No abstract record available.
Inventors
- 👤 Edward J Mellen Jr
- 👤 Edmond M Baker
- 👤 John M Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:38
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2679669A
Cited
CH302619A
Cited
US3066365A
Cited
US3037252A
Cited
US3077648A
Cited
GB903502A
Cited
US3112541A
Cited
US3266106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |