Patent US3586303A successfully refreshed from Google Patents.
US3586303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon mold for manufacture of tantalum carbide filaments
Assignee: Philips North America LLC
•
Filing: 1969-05-19
•
Granted: 1971-06-22
•
Expires: 1989-05-19
Abstract
Abstract A mold form for use in the carbiding of filament coils which substantially comprise tantalum and which mold form comprises a carbon block having a plurality of cylindrical bores therethrough. Each of the cylindrical bores are of a diameter only slightly larger than the external diameter of the filament coil which it is adapted to receive.
Inventors
- 👤 Stanley Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:03
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
31 words
A mold form according to claim 1 wherein the diameter of said cylindrical bores is less than 10 percent greater than the diameter of the filament coils to be carbided therein.
Claim 2
Dependent Claim
30 words
A mold form according to claim 1 wherein the diameter of said cylindrical bores is about 6 percent greater than the diameter of the filament coils to be carbided therein.
Claim 3
Dependent Claim
13 words
A mold form according to claim 1 wherein said carbon block is graphite.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |