US3558253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blow pipes
Assignee: William Allday and Co Ltd
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Filing: 1968-11-26
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Granted: 1971-01-26
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Expires: 1988-11-26
Abstract
Abstract A BLOWPIPE HEAD FOR BURNING GAS GUEL, FOR EXAMPLE NATURAL GAS, IN COMBINATION WITH PRESSURIZED AIR HAVING A CHAMBER FOR CONNECTION TO GAS FUEL AND AIR SUPPLIES AND A BURNER TUBE IN WHICH MIXED GAS FUEL AND AIR IS BURNT, WHEREIN A RESTRICTED VENTURI THROAT PASSAGE LEADING FROM THE CHAMBER TO THE BURNER TUBE IS AXIALLY ALIGNED WITH AN AIR NOZZLE IN THE CHAMBER TO DIRECT A JET OF THE PRESSURIZED AIR THROUGH THE THROAT, SO THAT GAS FUEL FED INTO THE CHAMBER IS DRAWN THROUGH THE THROAT AND MIXED WITH THE AIR.
Inventors
- 👤 Wilfred C Smith
- 👤 Richard W J Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:51
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/46; F23D14/62; F23D14/64; F23D14/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |