US3469934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying closed atmospheres
Assignee: Girdler Corp
•
Filing: 1964-10-26
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Granted: 1969-09-30
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Expires: 1984-10-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph P Bocard
- 👤 Richard L Harvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:08
CPC Classifications
A; A61; A61L; A61L9/00; A61L9/16; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/864; B01D53/869; B01D2253/00; B01D2253/10; B01D2253/102; B01D2257/00; B01D2257/10; B01D2257/108; B01D2257/50; B01D2257/502; B01D2257/504; B01D2257/70; B01D2257/702
Claims Analysis
Total Claims: 0
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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) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |