US2494267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface hardening of ferrous metals
Assignee: Individual
•
Filing: 1946-11-26
•
Granted: 1950-01-10
•
Expires: 1966-11-26
Abstract
No abstract record available.
Inventors
- 👤 Hermann I Schlesinger
- 👤 George W Schaeffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:30
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
THE METHOD OF PRODUCING A HARDENED SURFACE ON FEROUS METAL WHICH CONSISTS IN CONTACTING THE SURFACE OF SAID FERROUS METAL AND HEATING IT TO ABOUT 700*C. WITH GASEOUS DIBORANE AT SUBATMOSPHERIC PRESSURE OF BELOW 30 MILLIMETERS OF MERCURY WHEREBY METAL BORIDE IS FORMED.
Claim 2
Independent Claim
43 words
THE METHOD OF PRODUCING A HARDENED SURFACE ON FEROUS METAL WHICH CONSISTS IN CONTACTING THE SURFACE OF SAID FERROUS METAL AND HEATING IT TO ABOUT 700*C. WITH GASEOUS DIBORANE AT SUBATMOSPHERIC PRESSURE OF BELOW 30 MILLIMETERS OF MERCURY WHEREBY METAL BORIDE IS FORMED.
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) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |