Patent US3300992A successfully refreshed from Google Patents.
US3300992A
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High vacuum pumping with impregnated adsorbents
Assignee: Pittsburgh Activated Carbon Co
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Filing: 1964-11-03
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Granted: 1967-01-31
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Expires: 1984-11-03
Abstract
No abstract record available.
Inventors
- 👤 Donald G Hager
- 👤 Manes Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:03
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; F; F04; F04B; F04B37/00; F04B37/06; F04B37/08; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/112; B01D2257/00; B01D2257/10; B01D2257/108; B01D2259/00; B01D2259/40; B01D2259/416
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
IN A PROCESS OF CRYOGENIC PUMPING TO OBTAIN HIGH VACUUM BY REMOVING HYDROGEN THE IMPROVEMENT COMPRISING SORPTION PUMPING THE HYDROGEN ON ACTIVATED CARBON IMPREGNATED WITH A CHEMISORBER FOR HYDROGEN IN THE SYSTEM.
Claim 2
Dependent Claim
32 words
IN A PROCESS OF CRYOGENIC PUMPING TO OBTAIN HIGH VACUUM BY REMOVING HYDROGEN THE IMPROVEMENT COMPRISING SORPTION PUMPING THE HYDROGEN ON ACTIVATED CARBON IMPREGNATED WITH A CHEMISORBER FOR HYDROGEN IN THE SYSTEM.
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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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |