Patent US3223835A successfully refreshed from Google Patents.
US3223835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railroad switch heater
Assignee: Norfolk and Western Railway Co
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Filing: 1961-10-19
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Granted: 1965-12-14
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Expires: 1981-10-19
Abstract
No abstract record available.
Inventors
- 👤 William J Cherry
- 👤 Ivan H East
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:01
CPC Classifications
E; E01; E01B; E01B7/00; E01B7/24; B; B61; B61L; B61L1/00; B61L1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
A HEATER APPARATUS FOR A RAILROAD SWITCH HAVING TWO FIXED RAILS AND TWO MOVABLE RAILS COMPRISING: A PAIR OF DUCTS, EACH POSITIONED ADJACENT THE OUTSIDE OF EACH ONE OF THE TWO FIXED RAILS OF A RAILROAD SWITCH; A MAIN DUCT POSITIONED TRANSVERSE TO THE TWO FIXED RAILS AND CONNECTED TO THE PAIR OF DUCTS POSITIONED ADJACENT TO THE OUTSIDE OF EACH ONE OF THE TWO FIXED RAILS; HEATER MEANS SECURED TO ONE END OF THE MAIN DUCT FOR HEATING AIR; BLOWER MEANS SECURD TO ONE END OF THE MAIN DUCT FOR BLOWING THE HEATED AIR THROUGH THE MAIN DUCT; AND FOUR NOZZLES EXTENDING FROM THE MAIN DUCT, TWO OF THE NOZZLES COMMUNICATING WITH THE INTERIOR OF THE PAIR OF DUCTS POSITIONED ADJACENT THE OUTSIDE OF THE FIXED RAILS THROUGH ONE END OF THE DUCTS AND DIRECTING HEATED AIR INTO THE DUCTS TO MELT SNOW AND ICE FROM THE RAILS AND THE OTHER TWO NOZZLES BEING POSITIONED BETWEEN THE FIXED RAILS AND IN FRONT OF THE TWO MOVABLE RAILS FOR DIRECTING HEATED AIR TOWARDS THE POINTS OF THE MOVABLE RAILS FOR MELTING SNOW AND ICE FROM THE RAILS.
Claim 2
Dependent Claim
187 words
A HEATER APPARATUS FOR A RAILROAD SWITCH HAVING TWO FIXED RAILS AND TWO MOVABLE RAILS COMPRISING: A PAIR OF DUCTS, EACH POSITIONED ADJACENT THE OUTSIDE OF EACH ONE OF THE TWO FIXED RAILS OF A RAILROAD SWITCH; A MAIN DUCT POSITIONED TRANSVERSE TO THE TWO FIXED RAILS AND CONNECTED TO THE PAIR OF DUCTS POSITIONED ADJACENT TO THE OUTSIDE OF EACH ONE OF THE TWO FIXED RAILS; HEATER MEANS SECURED TO ONE END OF THE MAIN DUCT FOR HEATING AIR; BLOWER MEANS SECURD TO ONE END OF THE MAIN DUCT FOR BLOWING THE HEATED AIR THROUGH THE MAIN DUCT; AND FOUR NOZZLES EXTENDING FROM THE MAIN DUCT, TWO OF THE NOZZLES COMMUNICATING WITH THE INTERIOR OF THE PAIR OF DUCTS POSITIONED ADJACENT THE OUTSIDE OF THE FIXED RAILS THROUGH ONE END OF THE DUCTS AND DIRECTING HEATED AIR INTO THE DUCTS TO MELT SNOW AND ICE FROM THE RAILS AND THE OTHER TWO NOZZLES BEING POSITIONED BETWEEN THE FIXED RAILS AND IN FRONT OF THE TWO MOVABLE RAILS FOR DIRECTING HEATED AIR TOWARDS THE POINTS OF THE MOVABLE RAILS FOR MELTING SNOW AND ICE FROM THE RAILS.
References Cited (Backward Citations)
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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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |