Patent US3136447A successfully refreshed from Google Patents.
US3136447A
Expired / Lapsed
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Steam generators
Assignee: Foster Wheeler Inc
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Filing: 1962-01-31
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Granted: 1964-06-09
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Expires: 1982-01-31
Abstract
No abstract record available.
Inventors
- 👤 Lawrence Arthur Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:17
CPC Classifications
G; G21; G21C; G21C13/00; G21C13/02; G21C13/06; G21C13/073; G21C13/0735; F; F16; F16J; F16J13/00; F16J13/02; F16J13/12; F22; F22B; F22B1/00; F22B1/22; F23; F23M; F23M7/00; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A PRESSURE VESSEL HAVING AN ACCESS OPENING THEREIN, THE COMBINATION COMPRISING SPACED LUGS PROJECTING FROM THE WALL OF SAID OPENING DEFINING AN APPROXIMATELY L-SHAPED SEAT IN SAID OPENING, A CLOSURE MEMBER COMPRISING A DIAPHRAGM SEATED ON SAID LUGS AND FORMING A CLOSE FIT WITH THE SURFACES OF SAID SEAT, SAID DIAPHRAGM HAVING A PERIPHERAL FLANGE COOPERATING WITH SAID OPENING WALL AND WELD SEALED TO SAID WALL, A BACKING PLUG OF SUBSTANTIALLY GREATER THICKNESS THAN SAID DIAPHRAGM, AND MEANS IN SAID OPENING FOR RETAINING AND POSITION-
Claim 2
Dependent Claim
86 words
IN A PRESSURE VESSEL HAVING AN ACCESS OPENING THEREIN, THE COMBINATION COMPRISING SPACED LUGS PROJECTING FROM THE WALL OF SAID OPENING DEFINING AN APPROXIMATELY L-SHAPED SEAT IN SAID OPENING, A CLOSURE MEMBER COMPRISING A DIAPHRAGM SEATED ON SAID LUGS AND FORMING A CLOSE FIT WITH THE SURFACES OF SAID SEAT, SAID DIAPHRAGM HAVING A PERIPHERAL FLANGE COOPERATING WITH SAID OPENING WALL AND WELD SEALED TO SAID WALL, A BACKING PLUG OF SUBSTANTIALLY GREATER THICKNESS THAN SAID DIAPHRAGM, AND MEANS IN SAID OPENING FOR RETAINING AND POSITION-
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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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |