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US3519056A
Expired / Lapsed
US
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Method of manufacturing a mould for casting metal comprising a mixture of mineral fibres and carbonisable resin
Assignee: National Research Development Corp UK
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Filing: 1968-03-28
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Granted: 1970-07-07
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Expires: 1988-03-28
Abstract
No abstract record available.
Inventors
- 👤 Robert Lewis Bickerdike
- 👤 Garyth Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:55
CPC Classifications
B; B22; B22C; B22C23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2913788A
Cited
US3077413A
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US3066365A
Cited
US3166808A
Cited
US3374825A
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US3284862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |