Patent US3403940A successfully refreshed from Google Patents.
Patent US4781429A successfully refreshed from Google Patents.
Patent US3165228A successfully refreshed from Google Patents.
US3165228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Base for pressure vessels
Assignee: Pressed Steel Tank Co
•
Filing: 1962-02-05
•
Granted: 1965-01-12
•
Expires: 1982-02-05
Abstract
No abstract record available.
Inventors
- 👤 Milton F Kroesch
- 👤 Willert O Kugler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:25
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/08; F17C13/084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A METAL PRESSURE VESSEL HAVING AN OUTWARDLY CONVEX BOTTOM THE EXTERNAL SURFACE OF WHICH IS CHARACTERIZED BY AN ETCHED PORTION, A BOTTOM MEMBER COMPRISING A GENERALLY CIRCULAR DISK OF POLYVINYL CHLORIDE PLASTIC CONFORMING WITH AND ATTACHED TO SAID ETCHED PORTION OF SAID CONVEX BOTTOM, THE INTERFACE BETWEEN SAID CONVEX BOTTOM, AND A DISK CHARACTERIZED BY PORTIONS OF SAID PLASTIC BOTTOM MEMBER INTERMINGLED WITH SAID CONVEX BOTTOM, AND A POLYVINYL PRIMER DISPERSED THERETHROUGH TO FORM AN ADHERENT, INTERLOCKING BOND BETWEEN SAID BOTTOM MEMBER AND SAID CONVEX BOTTOM, SAID PLASTIC BOTTOM MEMBER COVERING SUBSTANTIALLY THE ENTIRE BOTTOM AREA OF SAID VESSEL AND BEING PROVIDED WITH AXIALLY PROJECTING SUPPORT MEANS ARRANGED GENERALLY CONCENTRIC WITH THE LONGITUDINAL AXIS OF SAID CYLINDER AND DEFINING A PLANAR SUPPORTING SURFACE LYING IN A PLANE SUBSTANTIALLY PERPENDICULAR TO THE LONGITUDINAL AXIS OF SAID VESSEL.
Claim 2
Dependent Claim
136 words
A METAL PRESSURE VESSEL HAVING AN OUTWARDLY CONVEX BOTTOM THE EXTERNAL SURFACE OF WHICH IS CHARACTERIZED BY AN ETCHED PORTION, A BOTTOM MEMBER COMPRISING A GENERALLY CIRCULAR DISK OF POLYVINYL CHLORIDE PLASTIC CONFORMING WITH AND ATTACHED TO SAID ETCHED PORTION OF SAID CONVEX BOTTOM, THE INTERFACE BETWEEN SAID CONVEX BOTTOM, AND A DISK CHARACTERIZED BY PORTIONS OF SAID PLASTIC BOTTOM MEMBER INTERMINGLED WITH SAID CONVEX BOTTOM, AND A POLYVINYL PRIMER DISPERSED THERETHROUGH TO FORM AN ADHERENT, INTERLOCKING BOND BETWEEN SAID BOTTOM MEMBER AND SAID CONVEX BOTTOM, SAID PLASTIC BOTTOM MEMBER COVERING SUBSTANTIALLY THE ENTIRE BOTTOM AREA OF SAID VESSEL AND BEING PROVIDED WITH AXIALLY PROJECTING SUPPORT MEANS ARRANGED GENERALLY CONCENTRIC WITH THE LONGITUDINAL AXIS OF SAID CYLINDER AND DEFINING A PLANAR SUPPORTING SURFACE LYING IN A PLANE SUBSTANTIALLY PERPENDICULAR TO THE LONGITUDINAL AXIS OF SAID VESSEL.
References Cited (Backward Citations)
US2016171A
Cited
US1985558A
Cited
US2033643A
Cited
US2067581A
Cited
US2720479A
Cited
US2951612A
Cited
US2956915A
Cited
US2872068A
Cited
US2847144A
Cited
US3004298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-01-12 | 1968-07-13 | 1969-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-12 | 1972-07-13 | 1973-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-12 | 1976-07-13 | 1977-01-12 | $7700.00 | Window Closed / Lapsed |