US3721100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold trap
Assignee: GTE Sylvania Inc
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Filing: 1971-08-05
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Granted: 1973-03-20
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Expires: 1991-08-05
Abstract
Abstract A method of preventing corrosive gases from entering the vacuum pump of a vacuum and fill system that is used in conjunction with lamp manufacture. In performing the method a cold trap, which may be a flask of liquid nitrogen is interposed in the line between the vacuum pump and the vessel to be evacuated. During the vacuum and fill operations, unused amounts of fill gases such as bromine and iodine normally would be drawn from the lamp into the vacuum pump. When the flask of liquid nitrogen is interposed in the line, however, the gases are collected in the trap.
Inventors
- 👤 R Bovio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:31
CPC Classifications
B; B01; B01D; B01D8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A vacuum system comprising: a vacuum manifold; a vacuum pump; a cold trap; a piping system interconnecting said manifold to said pump through said cold trap; a flask of liquid refrigerant within which a portion of said cold trap is immersed; a first pair of valves located within said piping system with one of said valves located adjacent to said vacuum manifold and the other of said valves located adjacent to said vacuum pump whereby communication within said piping system between said manifold and said pump may be regulated; a second pair of valves located within said piping system intermediate the valves of said first pair of valves, one of the valves of said second pair of valves being connected to a source of air under pressure and the other valve of the said second pair of valves being connected to an exhaust whereby said piping system intermediate said manifold and said pump, including said trap, may be flushed.
Claim 2
Dependent Claim
159 words
A vacuum system comprising: a vacuum manifold; a vacuum pump; a cold trap; a piping system interconnecting said manifold to said pump through said cold trap; a flask of liquid refrigerant within which a portion of said cold trap is immersed; a first pair of valves located within said piping system with one of said valves located adjacent to said vacuum manifold and the other of said valves located adjacent to said vacuum pump whereby communication within said piping system between said manifold and said pump may be regulated; a second pair of valves located within said piping system intermediate the valves of said first pair of valves, one of the valves of said second pair of valves being connected to a source of air under pressure and the other valve of the said second pair of valves being connected to an exhaust whereby said piping system intermediate said manifold and said pump, including said trap, may be flushed.
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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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |