Patent US3793014A successfully refreshed from Google Patents.
US3793014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for fabricating porous beryllium billets
Assignee: United States Department of the Air Force
•
Filing: 1973-03-15
•
Granted: 1974-02-19
•
Expires: 1993-03-15
Abstract
Abstract Porous beryllium billets are prepared by cold isostactic pressing of a mold containing beryllium powder, and sintering under a vacuum the resulting beryllium billet. The billets so produced are particularly useful as a matrix material for active transpiration systems.
Inventors
- 👤 S Rosenwasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:01
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F2998/00; B22F2998/10; B22F2999/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12153
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
25 words
The process according to claim 1 in which the billet is annealed by heatiNg at a temperature of about 1,350* F for about 1 hour.
Claim 2
Dependent Claim
33 words
The process according to claim 2 in which the billet is sintered under a vacuum at a temperature in the range of 2010 to 2035*F for a period of 2 to 4 hours.
Claim 3
Dependent Claim
21 words
A porous beryllium billet having a permeability in the range of 1 X 10 10 to 1 X 10 12 in2.
References Cited (Backward Citations)
US2794241A
Cited
US2818339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |