US2921776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas/liquid contact devices
Assignee: BOC Group Ltd
•
Filing: 1955-09-26
•
Granted: 1960-01-19
•
Expires: 1975-09-26
Abstract
No abstract record available.
Inventors
- 👤 Keeping William Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:34
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/30; B01J2219/00; B01J2219/30; B01J2219/302; B01J2219/30223; B01J2219/30257; B01J2219/304; B01J2219/30408; Y; Y10; Y10S; Y10S261/00; Y10S261/72
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) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |