US3235708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosion-proof electric radiant heater
Assignee: American Air Filter Co Inc
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Filing: 1963-07-29
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Granted: 1966-02-15
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Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 Harold L Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/08; F24C7/087; F24C7/088
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A RADIANT HEATER CONSTRUCTION AND CONTROL SYSTEM COMPRISING: (A) AN AIR TIGHT CASING ADAPTED TO BE PRESSURIZED AND HAVING ELECTRICAL HEATING MEANS THEREIN; (B) A SUPPLY OF COOLANT UNDER PRESSURE ADAPTED UPON RELEASE TO BE DISCHARGED INTERIORLY OF SAID CASING AND TO COOL SAID ELECTRIC HEATING MEANS; (C) MEANS RESTRICTING ENERGIZATION OF SAID ELECTRICAL HEATING MEANS TO AN INITIAL CONDITION OF AT LEAST A MINIMUM PRESSURE IN SAID CASING, AT LEAST ANOTHER MINIMUM PRESSURE OF SAID COOLANT SUPPLY, AND SELECTED SURFACE TEMPEATURE CONDITIONS OF SAID CASING BELOW A PREDETERMINED VALUE; AND, (D) MEANS FOR DE-ENERGIZING SAID ELECTRICAL HEATING MEANS AND RELEASING SAID COOLANT UPON REDUCTON OF PRESSURE IN SAID CASING BELOW SAID SAID FIRST MINIMUM PRESSURE.
Claim 2
Dependent Claim
116 words
A RADIANT HEATER CONSTRUCTION AND CONTROL SYSTEM COMPRISING: (A) AN AIR TIGHT CASING ADAPTED TO BE PRESSURIZED AND HAVING ELECTRICAL HEATING MEANS THEREIN; (B) A SUPPLY OF COOLANT UNDER PRESSURE ADAPTED UPON RELEASE TO BE DISCHARGED INTERIORLY OF SAID CASING AND TO COOL SAID ELECTRIC HEATING MEANS; (C) MEANS RESTRICTING ENERGIZATION OF SAID ELECTRICAL HEATING MEANS TO AN INITIAL CONDITION OF AT LEAST A MINIMUM PRESSURE IN SAID CASING, AT LEAST ANOTHER MINIMUM PRESSURE OF SAID COOLANT SUPPLY, AND SELECTED SURFACE TEMPEATURE CONDITIONS OF SAID CASING BELOW A PREDETERMINED VALUE; AND, (D) MEANS FOR DE-ENERGIZING SAID ELECTRICAL HEATING MEANS AND RELEASING SAID COOLANT UPON REDUCTON OF PRESSURE IN SAID CASING BELOW SAID SAID FIRST MINIMUM PRESSURE.
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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |