Seals
Abstract
Abstract SEAL ASSEMLIES HAVING A PRIMARY INITIAL SEAL MEANS OPEATIVE FOR SEALING BETWEEN TWO MEMBERS AT VARYING CONDITIONS OF PRESSURE AT NORMAL TEMPERATURES BELOW A PREDETERMINED ELEVATED TEMPERATURE, AND SECONDARY MALLEABLE METALLIC SEAL WHICH IS MOVABLE BY FLUID PRESSURE ACTING THROUGH THE PRIMARY SEAL TO PROVIDE A METAL TO METAL SEAL BETWEEN SAID MEMBERS UPON OCCURRENCE OF A TEMPERATURE AT SAID SEAL ASSEMBLIES EQUAL TO OR IN EXCESS OF SAID PREDETERMINED ELEVATED TEMPERATURE. MEANS IS PROVIDED FOR HOLDING ORE RESTRAINING THE SECONDARY SEAL MEANS IN NON-SEALING POSITION UNTIL THE OCCURRENCE AT LEAST OF THE PREDETERMINED ELEVATED TEMPERATURE, AND WHICH IS YIELDABLE OR RELEASABLE TO PERMIT SAID SECONDARY SEAL MEANS TO BE MOVED TO AN EFFECTIVE SEALING POSITION BY THE PRESSURE ACTING ON SAID PRIMARY SEAL PRIOR TO DESTRUCTION OR DAMAGE OF PRIMARY SEAL AS A RESULT OF THE ELEVATED TEMPERATURE. SEVERAL TYPES OF PRIMARY AND SECONDARY SEALS ARE ILLUSTRATED.
Inventors
- 👤 Arthur T Taylor
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 |