Patent US3787164A successfully refreshed from Google Patents.
Patent US3719912A successfully refreshed from Google Patents.
US3719912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust control device for circuit interrupting devices
Assignee: S&C Electric Co
•
Filing: 1971-10-26
•
Granted: 1973-03-06
•
Expires: 1991-10-26
Abstract
Abstract A mass of small diameter ceramic pellets, for example of activated alumina, is located in a cylindrical metallic housing between its closed end and metallic heat absorbent material in the housing through the open end of which flow arc products incident to blowing of a fuse or similar circuit interrupting device. An apertured deflector disc overlies the pellets and prevents bypassing thereof along the inner surface of the housing. One or more metallic filter elements in the closed end of the housing place the interior thereof in limited communication with the atmosphere.
Inventors
- 👤 R Harner
- 👤 O Meister
- 👤 R Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:30
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/43; H01H33/00; H01H33/02; H01H33/53; H01H33/58
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
132 words
An exhaust control device for a circuit interrupter comprising a housing for receiving at one end exhaust gas incident to opening of said circuit interrupter, a vented closure at the other end of said housing, a mass of spherical pellets of gas and metal vapor absorbent material selected from the class consisting of activated alumina, tabular alumina and hydrated alumina in said housing ranging in size from one-sixteenth inch to three-sixteenths inch in diameter to provide alternately large and small interstices therebetween for repetitive expansion and contraction of said exhaust gas to cool, condense and absorb metal vapor and decomposition gases of said exhaust gas; and metallic heat absorbent material in said housing between said one end and said mass of pellets for initially receiving and extracting heat from said exhaust gas.
Claim 2
Dependent Claim
132 words
An exhaust control device for a circuit interrupter comprising a housing for receiving at one end exhaust gas incident to opening of said circuit interrupter, a vented closure at the other end of said housing, a mass of spherical pellets of gas and metal vapor absorbent material selected from the class consisting of activated alumina, tabular alumina and hydrated alumina in said housing ranging in size from one-sixteenth inch to three-sixteenths inch in diameter to provide alternately large and small interstices therebetween for repetitive expansion and contraction of said exhaust gas to cool, condense and absorb metal vapor and decomposition gases of said exhaust gas; and metallic heat absorbent material in said housing between said one end and said mass of pellets for initially receiving and extracting heat from said exhaust gas.
Claim 3
Dependent Claim
30 words
An exhaust control device according to claim 1 wherein one or more metallic filters in said closure place the space occupied by said pellets in limited communication with the atmosphere.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |