US4469152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust-tight hatch closure assembly
Assignee: GE Chemicals Inc
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Filing: 1979-10-25
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Granted: 1984-09-04
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Expires: 1999-10-25
Abstract
Abstract A dust-tight hatch closure assembly for filling railway covered hopper cars having a filling means and a pneumatic seal in the form of an inflatable annulus.
Inventors
- 👤 Carl L. Hardee
- 👤 Robert E. Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:47
CPC Classifications
B; B67; B67D; B67D7/00; B67D7/005; B65; B65G; B65G69/00; B65G69/18; B65G69/181; Y; Y10; Y10S; Y10S277/00; Y10S277/921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A dust-tight hatch closure comprising an assembly of a lid, fill tube extending through said lid and joined thereto in a vapor-tight seal relationship, cylindrical support member joined to said lid in a vapor-tight relationship and surrounding said fill tube, outwardly-directed channel member attached to and surrounding said cylindrical support member, said channel member being a tire rim, an inflatable annulus surrounding and received by said channel member, said inflatable annulus being an inner tube, a protective covering surrounding said annulus and engaging said channel member, said protective covering being a tire, and means for inflating and deflating said inflatable annulus.
Claim 2
Dependent Claim
101 words
A dust-tight hatch closure comprising an assembly of a lid, fill tube extending through said lid and joined thereto in a vapor-tight seal relationship, cylindrical support member joined to said lid in a vapor-tight relationship and surrounding said fill tube, outwardly-directed channel member attached to and surrounding said cylindrical support member, said channel member being a tire rim, an inflatable annulus surrounding and received by said channel member, said inflatable annulus being an inner tube, a protective covering surrounding said annulus and engaging said channel member, said protective covering being a tire, and means for inflating and deflating said inflatable annulus.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |