Patent US3351438A successfully refreshed from Google Patents.
US3351438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten incandescent body of large crystalline structure and process for its production
Assignee: Egyesuelt Izzolampa es Villamossagi Rt
•
Filing: 1964-09-11
•
Granted: 1967-11-07
•
Expires: 1984-09-11
Abstract
No abstract record available.
Inventors
- 👤 Millner Tivadar
- 👤 Neugebauer Jeno
- 👤 Kerenyi Laszlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:16
CPC Classifications
H; H01; H01K; H01K3/00; H01K3/02; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22; C; C22; C22B; C22B34/00; C22B34/30; C22B34/36; C22C; C22C1/00; C22C1/04; C22C1/045; C22C27/00; C22C27/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
48 words
A SINTERED TUNGSTEN BODY OF LARGE CRSTALLINE TUNGSTEN STRUCTURE EFFECTIVE FOR INCANDESCENCE, SAID TUNGSTEN BODY CONTAINING GALLIUM AND IN WHICH THE GALLIUM TO TUNGSTEN CONTENT EXPRESSES AS THE RATIO OF GA2O3:WO3 OF THE INITIAL MATERIAL FROM WHICH THE TUNGSTEN BODY IS PREPARED, IS BETWEEN ABOUT 0.00001:1 AND 0.05:1.
Claim 2
Dependent Claim
48 words
A SINTERED TUNGSTEN BODY OF LARGE CRSTALLINE TUNGSTEN STRUCTURE EFFECTIVE FOR INCANDESCENCE, SAID TUNGSTEN BODY CONTAINING GALLIUM AND IN WHICH THE GALLIUM TO TUNGSTEN CONTENT EXPRESSES AS THE RATIO OF GA2O3:WO3 OF THE INITIAL MATERIAL FROM WHICH THE TUNGSTEN BODY IS PREPARED, IS BETWEEN ABOUT 0.00001:1 AND 0.05:1.
Claim 3
Dependent Claim
58 words
METHOD OF PRODUCING SINTERED TUNGSTEN OF LARGE CRYSTALLINE STRUCTURE, WHICH COMPRISES MIXING A GALLIUM COMPOUND CAPABLE OF FORMING AN OXIDE WITH TUNGSTEN OXIDE IN AN AMOUNT SUCH THAT THE RATIO OF GA2O3:WO3 IS BETWEEN ABOUT 0.00001:1 AND 0.05:1, REDUCING THE RESULTING OXIDE MIXTURE TO METAL POWDER, AND PRESSING AND SINTERING THE RESULTING METAL POWDER INTO A SOLID BODY.
Claim 4
Dependent Claim
58 words
METHOD OF PRODUCING SINTERED TUNGSTEN OF LARGE CRYSTALLINE STRUCTURE, WHICH COMPRISES MIXING A GALLIUM COMPOUND CAPABLE OF FORMING AN OXIDE WITH TUNGSTEN OXIDE IN AN AMOUNT SUCH THAT THE RATIO OF GA2O3:WO3 IS BETWEEN ABOUT 0.00001:1 AND 0.05:1, REDUCING THE RESULTING OXIDE MIXTURE TO METAL POWDER, AND PRESSING AND SINTERING THE RESULTING METAL POWDER INTO A SOLID BODY.
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) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |