US3168607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of heat treating articles
Assignee: Individual
•
Filing: 1960-12-28
•
Granted: 1965-02-02
•
Expires: 1980-12-28
Abstract
No abstract record available.
Inventors
- 👤 Greene Ben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:50
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A FURNACE FOR HEAT TREATING METAL ARTICLES COMPRISING IN COMBINATION, A FURANCE CHAMBER WHICH IS PRESSURE AND VACUUM TIGHT, A REFRACTORY BOUNDED CLOSED PATH WITHIN THE FURNACE CHAMBER INCLUDING A REFRIGERATOR, A REFRACTORY BOUNDED CLOSED PATH WITHIN THE FURNACE CHAMBER INCLUDING HEATING MEANS FOR HEATING INERT GAS TO A TEMPERATURE OF AT LEAST 1000*C., MEANS TO SELECT EITHER CLOSED PATH, A PUMP FOR CIRCULATING GASES THROUGH THE SELECTED PATH, MEANS TO SELECTIVELY INTRODUCE A SOURCE OF INERT GAS UNDER PRESSURE OF OVER 20 POUNDS PER SQUARE INCH ABSOLUTE, AND MEANS FOR SELECTIVELY PRODUCING A VACUUM IN THE CHAMBER.
Claim 2
Dependent Claim
98 words
A FURNACE FOR HEAT TREATING METAL ARTICLES COMPRISING IN COMBINATION, A FURANCE CHAMBER WHICH IS PRESSURE AND VACUUM TIGHT, A REFRACTORY BOUNDED CLOSED PATH WITHIN THE FURNACE CHAMBER INCLUDING A REFRIGERATOR, A REFRACTORY BOUNDED CLOSED PATH WITHIN THE FURNACE CHAMBER INCLUDING HEATING MEANS FOR HEATING INERT GAS TO A TEMPERATURE OF AT LEAST 1000*C., MEANS TO SELECT EITHER CLOSED PATH, A PUMP FOR CIRCULATING GASES THROUGH THE SELECTED PATH, MEANS TO SELECTIVELY INTRODUCE A SOURCE OF INERT GAS UNDER PRESSURE OF OVER 20 POUNDS PER SQUARE INCH ABSOLUTE, AND MEANS FOR SELECTIVELY PRODUCING A VACUUM IN THE CHAMBER.
References Cited (Backward Citations)
US1644828A
Cited
US1946545A
Cited
GB389887A
Cited
GB393987A
Cited
US1938306A
Cited
US2913239A
Cited
US3109877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |