US2944548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Venting structure
Assignee: Individual
•
Filing: 1957-03-18
•
Granted: 1960-07-12
•
Expires: 1977-03-18
Abstract
No abstract record available.
Inventors
- 👤 Eugene M Katzin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:39
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/162; A61M2005/1623; A61M2205/00; A61M2205/19; A61M2205/192; A61M2205/195
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190388A
Cited
US2100610A
Cited
US2416391A
Cited
US2473153A
Cited
US2568108A
Cited
US2581331A
Cited
US2775240A
Cited
FR1071557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |