Patent US3231012A successfully refreshed from Google Patents.
US3231012A
Expired / Lapsed
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Method and apparatus for replacing a seal in an expandable heat exchanger shell
Assignee: Pfaudler Inc
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Filing: 1963-10-30
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Granted: 1966-01-25
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Expires: 1983-10-30
Abstract
No abstract record available.
Inventors
- 👤 Carl W Norris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:58
CPC Classifications
F; F28; F28F; F28F9/00; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/06; Y10S165/061
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN A HEAT EXCHANGER OR LIKE CONSTRUCTION, (A) A SHELL DEFINING A CHAMBER HAVING AN OPEN END, (B) A CLOSURE MEMBER ADAPTED TO OVERLIE SAID SHELL OPEN END FOR CLOSURE THEREOF, (C) SEAL MEANS BETWEEN SAID SHELL OPEN END AND SAID CLOSURE MEMBER, (D) MEANS INCLUDING AN EXPANSION JOINT ON SAID SHELL MAINTAINING SAID CLOSURE MEMBER IN SUBSTANTIALLY CLOSED RELATIONSHIP WITH SAID SHELL OPEN END, AND (E) SEPARATION MEANS ENGAGING SAID SHELL FOR VARYING THE LENGTH OF SAID SHELL IN OPPOSITION TO SAID MAINTAINING MEANS FOR SEPARATING SAID SHELL OPEN END FROM SAID CLOSURE MEMBER A SUFFICIENT DISTANCE TO PERMIT REPLACEMENT OF SAID SEAL MEANS.
Claim 2
Dependent Claim
105 words
IN A HEAT EXCHANGER OR LIKE CONSTRUCTION, (A) A SHELL DEFINING A CHAMBER HAVING AN OPEN END, (B) A CLOSURE MEMBER ADAPTED TO OVERLIE SAID SHELL OPEN END FOR CLOSURE THEREOF, (C) SEAL MEANS BETWEEN SAID SHELL OPEN END AND SAID CLOSURE MEMBER, (D) MEANS INCLUDING AN EXPANSION JOINT ON SAID SHELL MAINTAINING SAID CLOSURE MEMBER IN SUBSTANTIALLY CLOSED RELATIONSHIP WITH SAID SHELL OPEN END, AND (E) SEPARATION MEANS ENGAGING SAID SHELL FOR VARYING THE LENGTH OF SAID SHELL IN OPPOSITION TO SAID MAINTAINING MEANS FOR SEPARATING SAID SHELL OPEN END FROM SAID CLOSURE MEMBER A SUFFICIENT DISTANCE TO PERMIT REPLACEMENT OF SAID SEAL MEANS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |