Patent EP0709205B1 successfully refreshed from Google Patents.
Patent EP0311066A2 successfully refreshed from Google Patents.
US2776872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus suitable for the fixation of nitrogen
Assignee: Babcock and Wilcox Co
•
Filing: 1953-04-09
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Granted: 1957-01-08
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Expires: 1973-04-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles L Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:42
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/02; C01C3/0208; C01C3/0212
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN A FIXED BED REFRACTORY TYPE HEATER SUITABLE FOR USE IN THE FIXATION OF ATMOSPHERIC NITROGEN, THREE SUPERIMPOSED CHAMBERS SUBSTANTIALLY FILLED WITH REFRACTORY PARTICLES, SAID CHAMBERS BEING IN GASEOUS COMMUNICATION WITH ONE ANOTHER THROUGH RESTRICTED OPENINGS THEREBETWEEN, A PAIR OF ANNULAR MANIFOLDS EACH CIRCUMFERENTIALLY EMBRACING THE OUTER END OF A DIFFERENT ONE OF THE END CHAMBERS AND IN GASEOUS COMMUNICATION WITH THE OUTER END OF THE ASSOCIATED END CHAMBER; GASEOUS MATERIAL INTRODUCTION CONDUIT MEANS AND GASEOUS MATERIAL WITHDRAWAL CONDUIT MEANS CONNECTED TO EACH OF SAID MANIFOLDS; CONTROL MEANS ASSOCIATED WITH SAID CONDUIT
Claim 2
Dependent Claim
92 words
IN A FIXED BED REFRACTORY TYPE HEATER SUITABLE FOR USE IN THE FIXATION OF ATMOSPHERIC NITROGEN, THREE SUPERIMPOSED CHAMBERS SUBSTANTIALLY FILLED WITH REFRACTORY PARTICLES, SAID CHAMBERS BEING IN GASEOUS COMMUNICATION WITH ONE ANOTHER THROUGH RESTRICTED OPENINGS THEREBETWEEN, A PAIR OF ANNULAR MANIFOLDS EACH CIRCUMFERENTIALLY EMBRACING THE OUTER END OF A DIFFERENT ONE OF THE END CHAMBERS AND IN GASEOUS COMMUNICATION WITH THE OUTER END OF THE ASSOCIATED END CHAMBER; GASEOUS MATERIAL INTRODUCTION CONDUIT MEANS AND GASEOUS MATERIAL WITHDRAWAL CONDUIT MEANS CONNECTED TO EACH OF SAID MANIFOLDS; CONTROL MEANS ASSOCIATED WITH SAID CONDUIT
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |