Patent US3453229A successfully refreshed from Google Patents.
US3453229A
Expired / Lapsed
US
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Material for making shell molds
Assignee: Sivyer Steel Casting Co
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Filing: 1967-02-28
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Granted: 1969-07-01
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Expires: 1987-02-28
Abstract
No abstract record available.
Inventors
- 👤 Alfred B Steck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:32
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/02
Claims Analysis
Total Claims: 0
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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) | 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 |