Patent US3511302A successfully refreshed from Google Patents.
US3511302A
Expired / Lapsed
US
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Method for producing a shell faced mold
Assignee: ROBERT H BARRON
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Filing: 1967-02-27
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Granted: 1970-05-12
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Expires: 1987-02-27
Abstract
No abstract record available.
Inventors
- 👤 Robert H Barron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:43
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/165; B22C23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR976345A
Cited
US2748435A
Cited
US2841844A
Cited
US2837798A
Cited
US2861307A
Cited
US2976588A
Cited
US3247556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |