US3202184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flue and duct construction
Assignee: Babcock and Wilcox Co
•
Filing: 1960-08-18
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Granted: 1965-08-24
•
Expires: 1980-08-18
Abstract
No abstract record available.
Inventors
- 👤 Russell L Godshalk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:26
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/003; F16L9/02; F16L9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A DUCT COMPRISING PLATE MEANS HAVING THEIR EDGE PORTIONS JOINED THROUGHOUT THEIR LENGTH TO FORM AN ELONGATED FLUID-TIGHT TUBULAR SECTION, A PLURALITY OF SPACED STIFFENERS EXTENDING LONGITUDINALLY OF SAID TUBULAR SECTION, SAID STIFFENERS BEING FIXEDLY CONNECTED TO THE INTERNAL SURFACE OF SAID TUBULAR SECTION AWND ARRANGED PARALLEL TO THE FLOW OF FLUID THERETHROUGH, AND A PLURALITY OF LONGITUDINALLY SPACED GIRTH MEMBERS DISPOSED NORMAL TO SAID LONGITUDINALLY EXTENDING STIFFENERS AND FIXEDLY POSITIONED RELATIVE TO SAID PLATE MEANS AND SAID STIFFENERS AND CONNECTED AT SPACED INTERVALS TO THE EXTERNAL SURFACE OF SAID TUBULAR SECTION, EACH OF SAID GIRTH MEMBERS FORMING A CLOSED RIGID MEMBER RESISTING THE TENDENCY OF SAID LONGITUDINALLY EXTENDING STIFFENERS AND SAID PLATE MEANS TO MOVE OUTWARDLY.
Claim 2
Dependent Claim
117 words
A DUCT COMPRISING PLATE MEANS HAVING THEIR EDGE PORTIONS JOINED THROUGHOUT THEIR LENGTH TO FORM AN ELONGATED FLUID-TIGHT TUBULAR SECTION, A PLURALITY OF SPACED STIFFENERS EXTENDING LONGITUDINALLY OF SAID TUBULAR SECTION, SAID STIFFENERS BEING FIXEDLY CONNECTED TO THE INTERNAL SURFACE OF SAID TUBULAR SECTION AWND ARRANGED PARALLEL TO THE FLOW OF FLUID THERETHROUGH, AND A PLURALITY OF LONGITUDINALLY SPACED GIRTH MEMBERS DISPOSED NORMAL TO SAID LONGITUDINALLY EXTENDING STIFFENERS AND FIXEDLY POSITIONED RELATIVE TO SAID PLATE MEANS AND SAID STIFFENERS AND CONNECTED AT SPACED INTERVALS TO THE EXTERNAL SURFACE OF SAID TUBULAR SECTION, EACH OF SAID GIRTH MEMBERS FORMING A CLOSED RIGID MEMBER RESISTING THE TENDENCY OF SAID LONGITUDINALLY EXTENDING STIFFENERS AND SAID PLATE MEANS TO MOVE OUTWARDLY.
References Cited (Backward Citations)
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Cited
US1191547A
Cited
US1293208A
Cited
US1963056A
Cited
FR719697A
Cited
US2187959A
Cited
US2722948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |