Patent US3422880A successfully refreshed from Google Patents.
US3422880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making investment shell molds for the high integrity precision casting of reactive and refractory metals
Assignee: Selmet Inc
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Filing: 1966-10-24
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Granted: 1969-01-21
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Expires: 1986-10-24
Abstract
No abstract record available.
Inventors
- 👤 Robert A Brown
- 👤 Clifford A Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:28
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/205; B22C1/165; B22C1/18; B22C3/00; B22C9/00; B22C9/02; B22C9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
THE METHOD OF MAKING AN INVESTMENT SHELL MOLD WHICH COMPRISES: (A) DIP COATING A DISPOSABLE PATTERN IN A LIQUID SUSPENSION OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF FINELY DIVIDED METALLIC COLUMBIUM, MOLYBDENUM, TANTALUM AND TUNGSTEN AND A BINDER THEREFOR COM-
Claim 2
Independent Claim
43 words
THE METHOD OF MAKING AN INVESTMENT SHELL MOLD WHICH COMPRISES: (A) DIP COATING A DISPOSABLE PATTERN IN A LIQUID SUSPENSION OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF FINELY DIVIDED METALLIC COLUMBIUM, MOLYBDENUM, TANTALUM AND TUNGSTEN AND A BINDER THEREFOR COM-
References Cited (Backward Citations)
US3125787A
Cited
US3248763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |