Patent US3219435A successfully refreshed from Google Patents.
US3219435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing metal blocks by electron beams
Assignee: WC Heraus GmbH and Co KG
•
Filing: 1960-04-08
•
Granted: 1965-11-23
•
Expires: 1980-04-08
Abstract
No abstract record available.
Inventors
- 👤 Gruber Helmut
- 👤 Scheidig Helmut
- 👤 Eckstein Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:09
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/30; H01J37/305; C; C22; C22B; C22B9/00; C22B9/16; C22B9/22; C22B9/228
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
A METHOD OF MELTING METAL WHICH COMPRISES DIRECTING A FOCUSED BEAM OF ELECTRONS FROM AN ELECTRON GUN THROUGH AN APERTURED DIAPHRAGM INTO A VACUUM FURNACE CHAMBER AGAINST THE TIP OF A CONSUMABLE ELECTRODE IN THE CHAMBER, MELTING METAL FROM THE ELECTRODE WITH SAID BEAM TO THEREBY FORM A MOLTEN POOL OF METAL BELOW THE ELECTRODE, DIRECTING A FOCUSED BEAM OF ELECTRON FROM AN ELECTRON GUN THROUGH AN APERTURED DIAPHRAGM INTO THE FURNACE CHAMBER AGAINST SAID MOLTEN POOL EVACUATING SAID CHAMBER TO A LOW PRESSURE AND SEPARATELY EVACUATING SAID GUN ON THE INLET SIDE OF SAID APERTURE DIAPHRAGM TO A LOWER PRESSURE.
References Cited (Backward Citations)
US2423729A
Cited
US2541764A
Cited
US2686822A
Cited
US2793282A
Cited
US2858199A
Cited
US2968723A
Cited
US2880483A
Cited
US3005859A
Cited
US2994801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |