Patent US2867227A successfully refreshed from Google Patents.
US2867227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential pressure gas supplying apparatus
Assignee: FIREWEL IND
•
Filing: 1954-03-01
•
Granted: 1959-01-06
•
Expires: 1974-03-01
Abstract
No abstract record available.
Inventors
- 👤 Lois W Meidenbauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:22
CPC Classifications
A; A62; A62B; A62B9/00; A62B9/02; B; B64; B64D; B64D10/00; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/1939; Y10T137/2012
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1962-01-05 | 1962-07-07 | 1963-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-05 | 1966-07-07 | 1967-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-05 | 1970-07-07 | 1971-01-06 | $7700.00 | Window Closed / Lapsed |