Patent US2684411A successfully refreshed from Google Patents.
US3239134A
Expired / Lapsed
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Residual gas removing means for vacuum pumps
Assignee: Sigmatron Nova Inc
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Filing: 1964-04-14
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Granted: 1966-03-08
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Expires: 1984-04-14
Abstract
No abstract record available.
Inventors
- 👤 Gordon N Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:30
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/14; H01J41/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN COMBINATION WITH A VACUUM PRODUCING SYSTEM CONNECTED TO A CHAMBER TO BE EVACUATED, A GETTER PUMP FOR REMOVING RESIDUAL GASES FROM SAID CHAMBER COMPRISING, AN ANNULAR VAPOR CONDENSING SURFACE ESTABLISHING A FLUID TIGHT CONNECTION BETWEEN THE VACUUM SYSTEM AND THE EVACUATED CHAMBER, A HEATING FILAMENT MOUNTED IN RADIALLY SPACED RELATION TO THE VAPOR CONDENSING SURFACE, A SOURCE OF REACTIVE MATERIAL CARRIED ON THE HEATING FILAMENT FOR VAPORIZATION, SHIELD MEANS MOUNTED IN CLOSE
Claim 2
Dependent Claim
73 words
IN COMBINATION WITH A VACUUM PRODUCING SYSTEM CONNECTED TO A CHAMBER TO BE EVACUATED, A GETTER PUMP FOR REMOVING RESIDUAL GASES FROM SAID CHAMBER COMPRISING, AN ANNULAR VAPOR CONDENSING SURFACE ESTABLISHING A FLUID TIGHT CONNECTION BETWEEN THE VACUUM SYSTEM AND THE EVACUATED CHAMBER, A HEATING FILAMENT MOUNTED IN RADIALLY SPACED RELATION TO THE VAPOR CONDENSING SURFACE, A SOURCE OF REACTIVE MATERIAL CARRIED ON THE HEATING FILAMENT FOR VAPORIZATION, SHIELD MEANS MOUNTED IN CLOSE
References Cited (Backward Citations)
US2888189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |