US3786130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum apparatus
Assignee: BOC Group Ltd
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Filing: 1971-06-23
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Granted: 1974-01-15
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Expires: 1991-06-23
Abstract
Abstract HYDROCARBON MOLECULES PRESENTS IN GAS BEING EVACUATED FROM A HOUSING BY A PUMP, OR LEAKING BACK INTO THE HOUSING FROM THE PUMP, ARE PERMANENTLY REMOVED BY PASSING THE GAS IN INTIMATE CONTACT WITH A CHEMISORPTION AGENT AT OR ABOVE ROOM TEMPERATURE.
Inventors
- 👤 M Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:16
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0446; F; F04; F04F; F04F9/00; B01D2253/00; B01D2253/10; B01D2253/102; B01D2257/00; B01D2257/70; B01D2257/702; B01D2259/00; B01D2259/40; B01D2259/416; F04C; F04C29/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |