Patent US3667979A successfully refreshed from Google Patents.
US3667979A
Expired / Lapsed
US
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Investment casting wax
Assignee: Sunoco Inc
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Filing: 1971-04-30
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Granted: 1972-06-06
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Expires: 1991-04-30
Abstract
Abstract AN IMPROVED INVESTMENT CASTING WAX COMPOSITION CONSISTING ESSENTIALLY OF ABOUT 35-65 WEIGHT PERCENT REFINED PETROLEUM WAX, SOLID CHLORONATED POLYPHENYL, ACID TYPE MONTAN WAX AND STEARIC ACID. SAID COMPOSITION HAS THE ADVANTAGE OF LOW SHRINKAGE, LOW PENETRATION AND RAPID SET UP.
Inventors
- 👤 John C Merges Jr
- 👤 Richard E Ware
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:49
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/02; C; C08; C08L; C08L91/00; C08L91/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |