US3919940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosive-activated plug
Assignee: Siemens AG
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Filing: 1973-08-15
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Granted: 1975-11-18
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Expires: 1993-08-15
Abstract
Abstract An explosive-activated plug for sealing the end of a defective tube in a heat exchanger having parts made of a nickel-chromium, heat-resistant alloy, is charged with a detonator and explosive encased by an aluminum sleeve and having compositions which leave only lead-free products of combustion after firing. This keeps the heat exchanger free from lead which tends to promote intergranular corrosion of the nickel-chromium alloy when the heat exchanging medium is pressurized water, and facilitates handling of the charge.
Inventors
- 👤 Manfred Ploger
- 👤 Lothar Stieding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:53
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/06; B23K20/08; B23K20/085; F; F28; F28F; F28F11/00; F28F11/02; F42; F42D; F42D3/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49352; Y10T29/49805; Y10T29/49806
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
AN EXPLOSIVE-ACTIVATED PLUG FOR SEALING THE END OF A TUBE COMPRISING PART OF A HEAT EXCHANGER INCLUDING TUBE PARTS MADE OF NICKEL-CHROMIUM, HEAT RESISTANT ALLOY; SAID PLUG BEING MADE OF A CORRESPONDING ALLOY AS THE NCIKERL CHROMIUM ALLOY AND SHAPED FOR A SNUG, SLIDEABLE INSERTION IN THE TUBE END AND HAVING A LONGITUDINALLY EXTENDING BLIND BORE IN WHICH IS REMOVABLY POSITIONED A CARTRIDGE INCLUDING A DETONATOR AND AN EXPLOSIVE, THE CARTRIDGE INCLUDING AN EXPLOSIVE FORCE-TRANSMITTING CAUSING MADE OF NON-METALLIC MATERIAL; WHEREIN THE IMPROVEMENT COMPRISES AND ALUMINUM THIN WALLED TUBING MECHANICALLY INTEGRATING BOTH SAID DETONATOR AND EXPLOSIVE, AND SAID DETONATOR AND EXPLOSIVE HAVING COMPOSITIONS WHICH AFTER COMBUSTION LEAVE ONLY LEAD-FREE DEPOSITS.
Claim 2
Dependent Claim
110 words
AN EXPLOSIVE-ACTIVATED PLUG FOR SEALING THE END OF A TUBE COMPRISING PART OF A HEAT EXCHANGER INCLUDING TUBE PARTS MADE OF NICKEL-CHROMIUM, HEAT RESISTANT ALLOY; SAID PLUG BEING MADE OF A CORRESPONDING ALLOY AS THE NCIKERL CHROMIUM ALLOY AND SHAPED FOR A SNUG, SLIDEABLE INSERTION IN THE TUBE END AND HAVING A LONGITUDINALLY EXTENDING BLIND BORE IN WHICH IS REMOVABLY POSITIONED A CARTRIDGE INCLUDING A DETONATOR AND AN EXPLOSIVE, THE CARTRIDGE INCLUDING AN EXPLOSIVE FORCE-TRANSMITTING CAUSING MADE OF NON-METALLIC MATERIAL; WHEREIN THE IMPROVEMENT COMPRISES AND ALUMINUM THIN WALLED TUBING MECHANICALLY INTEGRATING BOTH SAID DETONATOR AND EXPLOSIVE, AND SAID DETONATOR AND EXPLOSIVE HAVING COMPOSITIONS WHICH AFTER COMBUSTION LEAVE ONLY LEAD-FREE DEPOSITS.
Claim 3
Dependent Claim
33 words
The plug of claim 1 in which said thin walled tubing is a thin metal sleeve enclosing the detonator and explosive, said sleeve being inside of said force-transmitting casing made of non-metallic material.
Claim 4
Dependent Claim
22 words
The plug of claim 1 in which said detonator is a charge of diazodinitrophenol and said explosive is a charge of tetryl.
Claim 5
Dependent Claim
22 words
The plug of claim 2 in which said detonator is a charge of diazodinitrophenol and said explosive is a charge of tetryl.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |