Patent US4270845A successfully refreshed from Google Patents.
Patent US2944546A successfully refreshed from Google Patents.
US2944546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable respirators for anesthesia and other purposes
Assignee: Z AND W Manufacturing CORP
•
Filing: 1954-08-24
•
Granted: 1960-07-12
•
Expires: 1974-08-24
Abstract
No abstract record available.
Inventors
- 👤 Frank A Ziherl
- 👤 Arthur S Kish
- 👤 Robert A Hingson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:31
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/104
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE100605C
Cited
US1203391A
Cited
US1449047A
Cited
US2066517A
Cited
US2222247A
Cited
US2310021A
Cited
US2428425A
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 |