US3945240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion bonding separator
Assignee: RTX Corp
•
Filing: 1972-10-16
•
Granted: 1976-03-23
•
Expires: 1992-10-16
Abstract
Abstract A separator of solid boron nitride is utilized to prevent diffusion bonding between an alloy being worked at high temperature and the components of working apparatus.
Inventors
- 👤 Bruce T. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:52
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/224; B21; B21D; B21D37/00; B21D37/01; B21J; B21J3/00; B21J5/00; B21K; B21K5/00; B21K5/20; B23K20/00; B23K20/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
39 words
Metal deformation apparatus which comprises: at least one movable, pressure-exerting member; and a pressure-exerting surface on said member for contact with a solid metal article being processed, said surface consisting essentially of solid boron nitride of substantially full density.
Claim 2
Dependent Claim
39 words
Metal deformation apparatus which comprises: at least one movable, pressure-exerting member; and a pressure-exerting surface on said member for contact with a solid metal article being processed, said surface consisting essentially of solid boron nitride of substantially full density.
Claim 3
Dependent Claim
12 words
Apparatus according to claim 1 where: the apparatus is a forging press.
Claim 4
Dependent Claim
18 words
Apparatus according to claim 2 wherein: the pressure-exerting surface is formed in the shape of a die cavity.
Claim 5
Dependent Claim
8 words
Forging dies consisting essentially of cast boron nitride.
Claim 6
Dependent Claim
8 words
Forging dies consisting essentially of cast boron nitride.
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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |