US4356859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lost wax feeder and runner systems
Assignee: Rolls Royce PLC
•
Filing: 1981-01-15
•
Granted: 1982-11-02
•
Expires: 2001-01-15
Abstract
Abstract A wax pattern and runner assembly includes resilient means whereby upon expansion of the wax upon removal from a ceramic mould the resilient means are compressed.
Inventors
- 👤 Philip Savage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:54
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/02; B29; B29C; B29C33/00; B29C33/44; B29C33/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
32 words
A wax pattern and runner including crushable means, which means are compressed upon thermal expansion of the wax pattern and runner when the wax is heated and removed from a ceramic mould.
Claim 2
Dependent Claim
32 words
A wax pattern and runner including crushable means, which means are compressed upon thermal expansion of the wax pattern and runner when the wax is heated and removed from a ceramic mould.
Claim 3
Dependent Claim
23 words
A wax pattern as claimed in claim 1 in which the at least one crushable portion is included upon or within the runner.
Claim 4
Dependent Claim
35 words
A wax pattern as claimed in claim 1 in which the at least one crushable portion is secured to the outer surface of the runner, or within a depression or pocket upon the surface thereof.
Claim 5
Dependent Claim
24 words
A wax pattern as claimed in claim 1 in which the at least one crushable portion is secured within the runner during its manufacture.
Claim 6
Dependent Claim
23 words
A wax pattern as claimed in claim 1 in which the at least one crushable portion comprises a strip of expanded polystyrene foam.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |