Patent US3721089A successfully refreshed from Google Patents.
US3721089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crossover tube construction
Assignee: RTX Corp
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Filing: 1971-06-08
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Granted: 1973-03-20
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Expires: 1991-06-08
Abstract
Abstract A crossover tube construction includes a crossover tube on one flame tube with a flange on the outer end thereof cooperating with a flanged ring loosely mounted on the cooperating crossover tube on the adjacent flame tube with a ring overlying said flanges to hold them closely adjacent and permit relative transverse movement between adjacent flame tubes.
Inventors
- 👤 A Morrison
- 👤 F Hetzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:02
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/42; F23R3/46; F23R3/48; F16; F16B; F16B2200/00; F16B2200/50; F16B2200/509
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
130 words
In a burner construction the combination with closely spaced substantially parallel flame tubes, of a laterally projecting crossover tube on each of the flame tubes, said tubes extending toward one another from the adjacent flame tubes and being in substantial alignment with one another, a circular flange formed on thE end of one of said tube extensions, a ring having a cylindrical portion loosely surrounding the other tube and having an outwardly extending flange at one end thereof, said flanges overlying and in substantially parallel relation with one another, and a retaining member U-shaped in cross section surrounding said flanges and overlying both flanges to hold them in closely adjacent relation, said retaining member having a projecting tab overlying and secured to a cooperating projecting tab on said circular flange.
Claim 2
Dependent Claim
130 words
In a burner construction the combination with closely spaced substantially parallel flame tubes, of a laterally projecting crossover tube on each of the flame tubes, said tubes extending toward one another from the adjacent flame tubes and being in substantial alignment with one another, a circular flange formed on thE end of one of said tube extensions, a ring having a cylindrical portion loosely surrounding the other tube and having an outwardly extending flange at one end thereof, said flanges overlying and in substantially parallel relation with one another, and a retaining member U-shaped in cross section surrounding said flanges and overlying both flanges to hold them in closely adjacent relation, said retaining member having a projecting tab overlying and secured to a cooperating projecting tab on said circular flange.
Claim 3
Dependent Claim
140 words
In a burner construction the combination with closely spaced substantially parallel flame tubes, of a laterally projecting crossover tube on each of the flame tubes, said tubes extending toward one another from the adjacent flame tubes and being in substantial alignment with one another, a circular flange formed on the end of one of said tube extensions, a ring having a cylindrical portion loosely surrounding the other tube and having an outwardly extending flange at one end thereof, said circular flange being larger in diameter than said outwardly extending flange said flanges overlying and in substantially parallel relation with one another, and a retaining member U-shaped in cross section surrounding said flanges and overlying both flanges to hold them in closely adjacent relation, said circular flange having a laterally extending rim deeper than the thickness of the outwardly extending flange.
Claim 4
Dependent Claim
140 words
In a burner construction the combination with closely spaced substantially parallel flame tubes, of a laterally projecting crossover tube on each of the flame tubes, said tubes extending toward one another from the adjacent flame tubes and being in substantial alignment with one another, a circular flange formed on the end of one of said tube extensions, a ring having a cylindrical portion loosely surrounding the other tube and having an outwardly extending flange at one end thereof, said circular flange being larger in diameter than said outwardly extending flange said flanges overlying and in substantially parallel relation with one another, and a retaining member U-shaped in cross section surrounding said flanges and overlying both flanges to hold them in closely adjacent relation, said circular flange having a laterally extending rim deeper than the thickness of the outwardly extending flange.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |