US3038221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for hardening foundry cores and foundry moulds by means of gaseous or atomized reagents, particularly co2 gas
Assignee: Individual
•
Filing: 1959-08-11
•
Granted: 1962-06-12
•
Expires: 1979-08-11
Abstract
No abstract record available.
Inventors
- 👤 Hansberg Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:14
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/162; B22C9/00; B22C9/12; B22C9/123
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN AN APPARATUS FOR HARDENING MOLDED FOUNDRY CORES AND MOLDS BY FIRST EVACUTING THE MOLDS AND CORES IN A VACUUM CHAMBER TO LIBERATE AIR INCLUSIONS IN SAID CORES AND MOLDS, THEN SUBJECTING THE EVACUATED CORES AND MOLDS IN SAID CHAMBER TO THE ACTION OF A GASEOUS HARDENING AGENT, VACUUM PUMP MEANS INCLUDING CYLINDERS DISPOSED IN TANDEM, A TWIN PISTON DISPLACEABLE IN SAID CYLINDERS, ONE OF SAID CYLINDERS BEING A SUCTION CYLINDER WITH A LARGE SUCTION CAPACITY IN RESPONSE TO A SHORT PISTON STROKE AND MEANS COATING WITH THE OTHER CYLINDER FOR SELECTIVELY RECIPROCATING THE PISTONS THEREIN, A WALL OF ONE OF SAID CYLINDERS CONSTITUTING A SUPPORT FRAME, A SUPPORT TABLE FOR SAID CORES AND MOLDS HAVING AN OPENING THEREIN MOUNTED ON SAID WALL, A BELL CHAMBER MOVABLY MOUNTED ON SAID TABLE AND FACING SAID TABLE WITH ITS OPEN SIDE, A SWALING MEANS AT THE
Claim 2
Dependent Claim
144 words
IN AN APPARATUS FOR HARDENING MOLDED FOUNDRY CORES AND MOLDS BY FIRST EVACUTING THE MOLDS AND CORES IN A VACUUM CHAMBER TO LIBERATE AIR INCLUSIONS IN SAID CORES AND MOLDS, THEN SUBJECTING THE EVACUATED CORES AND MOLDS IN SAID CHAMBER TO THE ACTION OF A GASEOUS HARDENING AGENT, VACUUM PUMP MEANS INCLUDING CYLINDERS DISPOSED IN TANDEM, A TWIN PISTON DISPLACEABLE IN SAID CYLINDERS, ONE OF SAID CYLINDERS BEING A SUCTION CYLINDER WITH A LARGE SUCTION CAPACITY IN RESPONSE TO A SHORT PISTON STROKE AND MEANS COATING WITH THE OTHER CYLINDER FOR SELECTIVELY RECIPROCATING THE PISTONS THEREIN, A WALL OF ONE OF SAID CYLINDERS CONSTITUTING A SUPPORT FRAME, A SUPPORT TABLE FOR SAID CORES AND MOLDS HAVING AN OPENING THEREIN MOUNTED ON SAID WALL, A BELL CHAMBER MOVABLY MOUNTED ON SAID TABLE AND FACING SAID TABLE WITH ITS OPEN SIDE, A SWALING MEANS AT THE
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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) | 1965-06-11 | 1965-12-11 | 1966-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-11 | 1969-12-11 | 1970-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-11 | 1973-12-11 | 1974-06-12 | $7700.00 | Window Closed / Lapsed |