US3259947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction heating method for making molds
Assignee: Individual
•
Filing: 1964-11-05
•
Granted: 1966-07-12
•
Expires: 1984-11-05
Abstract
No abstract record available.
Inventors
- 👤 Harry R Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:27
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
A METHOD OF MAKING CORES AND MOLDS, COMPRISING THE STEPS OF: PROVIDING A MIXTURE OF PARTICULATE REFRACTORY MATERIAL HAVING THEREIN A HEAT RESPONSIVE BINDING AGENT CAPABLE OF BINDING SAID PARTICULATE MATERIAL INTO AN INTEGRAL ARTICLE WHEN HEATED; DISPERSING THROUGH SAID MATERIAL A SMALL AMOUNT OF A FINELY DIVIDED PARAMAGNETIC POWDER; FORMING THE RESULTING MIXTURE INTO A DESIRED CONFIGURATION; AND APPLYING TO THE RESULTANT MIXTURE FOR SEVERAL SECONDS A HIGH FREQUENCY MAGNETIC FIELD, CREATING HEAT UNIFORMLY THROUGHOUT SAID MATERIAL IN SAID BINDING AGENT IN PROPORTION TO THE MASS OF THE MIXTURE, TO UNIFORMLY CURE SAID BINDING AGENT.
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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) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |