US3171174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frozen-mercury process for making shell molds
Assignee: Individual
•
Filing: 1963-06-06
•
Granted: 1965-03-02
•
Expires: 1983-06-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward J Mellen
- 👤 John M Webb
- 👤 Fasselle Robert J De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:38
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A PROCESS OF FORMING SHELL MOLDS FROM FROZEN MERCURY PATTERNS, THE STEPS, IN A SUBSTANTIALLY ENCLOSED SYSTEM, OF DISPOSING THE PATTERN IN A DIP CHAMBER AND DIPPING THE PATTERN IN A SLURRY MIXTURE WHICH IS MAINTAINED AT BELOW -50*F. AND COMPRISES REFRACTORY MATERIALS, BINDER AND A LIQUID VEHICLE TO FORM A COATING OF SAID SLURRY MIXTURE ON SAID PATTERN, DISPOSING SAID DIPPED MERCURY PATTERN IN A DRYING CHAMBER WHICH HAS AN ATMOSPHERE WHICH HAS A DRY-BULB TEMPERATURE MATERIALLY HIGHER THAN THE SOFTENING TEMPERATURE OF THE MERCURY PATTERN AND SUBSTANTIALLY ABOVE THE BOILING POINT OF THE SLURRY VEHICLE AND
Claim 2
Dependent Claim
99 words
IN A PROCESS OF FORMING SHELL MOLDS FROM FROZEN MERCURY PATTERNS, THE STEPS, IN A SUBSTANTIALLY ENCLOSED SYSTEM, OF DISPOSING THE PATTERN IN A DIP CHAMBER AND DIPPING THE PATTERN IN A SLURRY MIXTURE WHICH IS MAINTAINED AT BELOW -50*F. AND COMPRISES REFRACTORY MATERIALS, BINDER AND A LIQUID VEHICLE TO FORM A COATING OF SAID SLURRY MIXTURE ON SAID PATTERN, DISPOSING SAID DIPPED MERCURY PATTERN IN A DRYING CHAMBER WHICH HAS AN ATMOSPHERE WHICH HAS A DRY-BULB TEMPERATURE MATERIALLY HIGHER THAN THE SOFTENING TEMPERATURE OF THE MERCURY PATTERN AND SUBSTANTIALLY ABOVE THE BOILING POINT OF THE SLURRY VEHICLE AND
References Cited (Backward Citations)
US2441695A
Cited
US2518040A
Cited
US2820268A
Cited
US2857641A
Cited
US2912729A
Cited
US2961751A
Cited
US2932864A
Cited
US3038221A
Cited
US3094751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |