US3255803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torch with igniter
Assignee: Harris Calorific Co
•
Filing: 1962-08-23
•
Granted: 1966-06-14
•
Expires: 1982-08-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank Hach
- 👤 Alfred E Burnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:42
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/38; F23D2207/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
IN A NOZZLE FOR DIRECTING A STREAM OF A HIGHLY COMBUSTIBLE MIXTURE FROM A BLOW PIPE, AN OUTPUT FOR SAID STREAM ON ONE END OF SAID NOZZLE, A PLENUM CHAMBER IN SAID NOZZLE, THE IMPROVEMENT COMPRISING: FIRST MEANS FORMING A SPARK GAP WITHIN SAID NOZZLE AND SECOND MEANS FOR PREVENTING PROPAGATION INTO SAID CHAMBER OF A FLAME FRONT INITIATED BY A SPARK ACROSS SAID GAP, SAID FIRST MEANS COMPRISNG AN INNER AND AN OUTER CNDUCTIVE SLEEVE AND MEANS FOR MOUNTING SAID SLEEVES WITH THE END OF SAID INNER SLEEVE SPACED ONLY SLIGHTLY FROM SAID OUTER SLEEVE AT A POSITION NEAR THE OUTLET OF SAID NOZZLE, MEANS FOR INSULATING THE REMAINDER OF SAID INNER SLEEVE FROM SAID OUTER SLEEVE, SAID SECOND MEANS COMPRISING A SMALL CROSSSECTIONAL AREA VELOCITY PASSAGEWAY EXTENDING FROM SAID CHAMBER AND HAVING AN ENTRANT END AND AN EXIT END, AND A SMALL BLEED PASSAGE BETWEEN SAID VELOCITY PASSAGEWAY
Claim 2
Dependent Claim
150 words
IN A NOZZLE FOR DIRECTING A STREAM OF A HIGHLY COMBUSTIBLE MIXTURE FROM A BLOW PIPE, AN OUTPUT FOR SAID STREAM ON ONE END OF SAID NOZZLE, A PLENUM CHAMBER IN SAID NOZZLE, THE IMPROVEMENT COMPRISING: FIRST MEANS FORMING A SPARK GAP WITHIN SAID NOZZLE AND SECOND MEANS FOR PREVENTING PROPAGATION INTO SAID CHAMBER OF A FLAME FRONT INITIATED BY A SPARK ACROSS SAID GAP, SAID FIRST MEANS COMPRISNG AN INNER AND AN OUTER CNDUCTIVE SLEEVE AND MEANS FOR MOUNTING SAID SLEEVES WITH THE END OF SAID INNER SLEEVE SPACED ONLY SLIGHTLY FROM SAID OUTER SLEEVE AT A POSITION NEAR THE OUTLET OF SAID NOZZLE, MEANS FOR INSULATING THE REMAINDER OF SAID INNER SLEEVE FROM SAID OUTER SLEEVE, SAID SECOND MEANS COMPRISING A SMALL CROSSSECTIONAL AREA VELOCITY PASSAGEWAY EXTENDING FROM SAID CHAMBER AND HAVING AN ENTRANT END AND AN EXIT END, AND A SMALL BLEED PASSAGE BETWEEN SAID VELOCITY PASSAGEWAY
References Cited (Backward Citations)
US2398611A
Cited
US2371970A
Cited
US2373309A
Cited
US2506114A
Cited
US2596729A
Cited
US2507102A
Cited
US2702079A
Cited
US2888066A
Cited
US3082333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |