Pressure vessels
Abstract
Abstract A CLOSURE ASSEMBLY FOR PRESSURE VESSELS, SUCH AS BOILERS, HEAT EXCHANGERS AND AUTOCLAVES WHEREIN AT LEAST TWO MEDIUMS ARE PASSED IN HEAT EXCHANGE RELATIONSHIP THERETO AND WHEREIN EACH MEDIUM IS UNDER A SEPARATE PRESSURE WHEREBY THE DIFFERENTIAL MAY BE OF RELATIVELY HIGH MAGNITUDE. A TUVE SHEET IS POSITIONED WITHIN THE END CLOSURE MEMBER OF THE VESSEL ON A SHOULDER PORTION THEREOF. A RETAINING RING ASSEMBLY IS INSERTED INTO THE CLOSURE MEMBER AND COOPERATES WITH A SHOULDERED PORTION ON THE TUBE SHEET TO RESTRAIN THE LATTER WITHIN THE CLOSURE MEMBER. A COLLECTION RING IS THEREAFTER AFFIXED ABOUT THE RETAINING RING ASSEMBLY TO FORM A COLLECTION ZONE. LATERALLY SPACED APART FROM SAID TUBE SHEET, TO FORM AN INLET ZONE WITH AN INLET CONDUIT PROVIDED IN SAID CLOSURE MEMBER, IS A COVER WHICH IS SIMILARLY POSITIONED WITHIN SAID CLOSURE MEMBER AS THE TUBE SHEET. A SECOND RETAINING RING ASSEMBLY AND COLLECTION RING ARE FITTED AND AFFIXED, RESPECTIVELY TO FORM A SECOND COLLECTION ZONE.
Inventors
- 👤 Colin Smith
Bibliographic Details
Claims Analysis
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |