Patent US3303535A successfully refreshed from Google Patents.
US3303535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand mold patterns formed of porous or permeable metal
Assignee: Owens Development Corp
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Filing: 1963-10-18
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Granted: 1967-02-14
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Expires: 1983-10-18
Abstract
No abstract record available.
Inventors
- 👤 Earl M Rearwin
- 👤 William R Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:38
CPC Classifications
B; B22; B22C; B22C11/00; B22C11/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN AN APPARATUS FOR SHAPING A MIXTURE OF SAND OR THE LIKE INTO A RELATIVELY SELF-SUPPORTING BODY BY COMPRESSING THE SAND IN CONTACT WITH A RIGID PATTERN: FLASK MEANS AND AT LEAST ONE RIGID PATTERN DEFINING TOGETHER A SAND RETAINING CHAMBER; SAID PATTERN BEING CONTOURED TO IMPRESS A COMPLEMENTARY CONTOUR IN THE SAND AND HAVING A SUBSTANTIAL PORTION CONSTRUCTED OF POROUS, GAS-PERMEABLE MATERIAL HAVING A LARGE NUMBER OF SMALL DIAMETER PASSAGEWAYS THERETHROUGH, SAID PORTION EXTENDING FROM THE FRONT SURFACE OF SAID PATTERN WHICH CONTACTS THE SAND TO THE REAR SURFACE OF SAID POROUS PORTION; A PATTERN SUPPORT PLATE CARRYING SAID PATTERN, SAID PLATE HAVING A CAVITY THEREIN FACING THE REAR SURFACE OF SAID PATTERN AND DEFINING THEREWITH A SECOND CHAMBER WHICH IS COEXTENSIVE WITH SAID POROUS PORTION, SAID PLATE HAVING AN APERTURE THEREIN FOR INTRODUCING OR WITHDRAWING FLUID FROM SAID SECOND CHAMBER
Claim 2
Dependent Claim
142 words
IN AN APPARATUS FOR SHAPING A MIXTURE OF SAND OR THE LIKE INTO A RELATIVELY SELF-SUPPORTING BODY BY COMPRESSING THE SAND IN CONTACT WITH A RIGID PATTERN: FLASK MEANS AND AT LEAST ONE RIGID PATTERN DEFINING TOGETHER A SAND RETAINING CHAMBER; SAID PATTERN BEING CONTOURED TO IMPRESS A COMPLEMENTARY CONTOUR IN THE SAND AND HAVING A SUBSTANTIAL PORTION CONSTRUCTED OF POROUS, GAS-PERMEABLE MATERIAL HAVING A LARGE NUMBER OF SMALL DIAMETER PASSAGEWAYS THERETHROUGH, SAID PORTION EXTENDING FROM THE FRONT SURFACE OF SAID PATTERN WHICH CONTACTS THE SAND TO THE REAR SURFACE OF SAID POROUS PORTION; A PATTERN SUPPORT PLATE CARRYING SAID PATTERN, SAID PLATE HAVING A CAVITY THEREIN FACING THE REAR SURFACE OF SAID PATTERN AND DEFINING THEREWITH A SECOND CHAMBER WHICH IS COEXTENSIVE WITH SAID POROUS PORTION, SAID PLATE HAVING AN APERTURE THEREIN FOR INTRODUCING OR WITHDRAWING FLUID FROM SAID SECOND CHAMBER
References Cited (Backward Citations)
US1475935A
Cited
GB330018A
Cited
US2331000A
Cited
US2367648A
Cited
US2871527A
Cited
US3008199A
Cited
US3101514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |