Patent US3140518A successfully refreshed from Google Patents.
US3140518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a core for casting a copper transformer element
Assignee: Individual
•
Filing: 1962-04-26
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Granted: 1964-07-14
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Expires: 1982-04-26
Abstract
No abstract record available.
Inventors
- 👤 Kruithoff Neal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:18
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/10; B22C23/00; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A METHOD OF MAKING A GAS CONDUCTING, COMPLEXLY CONFIGURATED CORE FOR CASTING NON-FERROUS ARTICLES, COMPRISING THE STEPS OF: PROVIDING A CORE BOX HAVING A CAVITY CORRESPONDING IN SHAPE TO THE CORE TO BE MADE; ARRANGING AT LEAST ONE ELONGATED WIRE-TYPE MEMBER IN A CURVED FASHION ALONG THE CENTAL PORTIONS OF AND EXTENDING TO THE EDGES OF SAID CAVITY IN CONFORMITY WITH THE COMPLEX CONFIGURATION OF SAID CAVITY; FILLING SAID CAVITY AROUND SAID ELONGATED MEMBER WITH AN UNCOMPACTED AND THUS POROUS MIXTURE OF DRY SAND AND PHENOLIC RESIN BINDER; HEATING SAID CORE MIXTURE IN SID CORE BOX TO PARTIALLY CURE SAID PHENOLIC RESIN TO A SEMI-PLASTIC, SELF SUSTAINING, NONCRUMBLING STATE WHEREBY SAID ELONGATED MEMBER MAY BE READILY WITHDRAWN WITHOUT SAGGING OF SAID CORE MATERIAL; WITHDRAWING SIAD ELONGATED MEMBER TO LEAVE A DUCT IN THE CORE; AND THEN HEATING SAID CORE MIXTURE FURTHER TO COMPLETELY CURE SAID CORE TO A RIGID STATE.
Claim 2
Independent Claim
150 words
A METHOD OF MAKING A GAS CONDUCTING, COMPLEXLY CONFIGURATED CORE FOR CASTING NON-FERROUS ARTICLES, COMPRISING THE STEPS OF: PROVIDING A CORE BOX HAVING A CAVITY CORRESPONDING IN SHAPE TO THE CORE TO BE MADE; ARRANGING AT LEAST ONE ELONGATED WIRE-TYPE MEMBER IN A CURVED FASHION ALONG THE CENTAL PORTIONS OF AND EXTENDING TO THE EDGES OF SAID CAVITY IN CONFORMITY WITH THE COMPLEX CONFIGURATION OF SAID CAVITY; FILLING SAID CAVITY AROUND SAID ELONGATED MEMBER WITH AN UNCOMPACTED AND THUS POROUS MIXTURE OF DRY SAND AND PHENOLIC RESIN BINDER; HEATING SAID CORE MIXTURE IN SID CORE BOX TO PARTIALLY CURE SAID PHENOLIC RESIN TO A SEMI-PLASTIC, SELF SUSTAINING, NONCRUMBLING STATE WHEREBY SAID ELONGATED MEMBER MAY BE READILY WITHDRAWN WITHOUT SAGGING OF SAID CORE MATERIAL; WITHDRAWING SIAD ELONGATED MEMBER TO LEAVE A DUCT IN THE CORE; AND THEN HEATING SAID CORE MIXTURE FURTHER TO COMPLETELY CURE SAID CORE TO A RIGID STATE.
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) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |