US4251927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper drier drum
Assignee: Ingersoll Rand Co
•
Filing: 1979-12-17
•
Granted: 1981-02-24
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Expires: 1999-12-17
Abstract
Abstract Hot gas is used to dry the paper on a rotatable drum. A plurality of spokes interconnect a rotatable shaft and the drum. The hot gas flows within the drum and directly contacts the spokes. The spokes extend tangentially from the shaft to the drum.
Inventors
- 👤 Oscar Luthi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:37
CPC Classifications
D; D21; D21F; D21F5/00; D21F5/18; D21F5/182
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 words
An apparatus for drying paper with hot gas comprising: a drum; a coaxial rotatable shaft; a plurality of spokes interconnecting the shaft and the drum; and a hot gas flow path including hot gas flowing within the drum and also directly contacting the spokes; said spokes being tangentially related to the shaft and extending from the shaft to the drum so as to allow for expansion of said spokes without deformation of said drum.
Claim 2
Independent Claim
74 words
An apparatus for drying paper with hot gas comprising: a drum; a coaxial rotatable shaft; a plurality of spokes interconnecting the shaft and the drum; and a hot gas flow path including hot gas flowing within the drum and also directly contacting the spokes; said spokes being tangentially related to the shaft and extending from the shaft to the drum so as to allow for expansion of said spokes without deformation of said drum.
Claim 3
Dependent Claim
23 words
An apparatus in accordance with claim 1 wherein: the outer ends of the spokes are attached to the drum by a doubler plate.
Claim 4
Dependent Claim
23 words
An apparatus in accordance with claim 1 wherein: the outer ends of the spokes are attached to the drum by a hinged connection.
Claim 5
Dependent Claim
16 words
An apparatus in accordance with claim 1 wherein: the spokes are straight along their entire length.
References Cited (Backward Citations)
US3794462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |