Patent US2831607A successfully refreshed from Google Patents.
US2831607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhalation apparatus
Assignee: WALTER W STILLMAN
•
Filing: 1955-04-29
•
Granted: 1958-04-22
•
Expires: 1975-04-29
Abstract
No abstract record available.
Inventors
- 👤 Alexander J Berndt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:59
CPC Classifications
A; A61; A61M; A61M16/00; A61M2209/00; A61M2209/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1234932A
Cited
US1654004A
Cited
US2002883A
Cited
US2517301A
Cited
US2531650A
Cited
US2479967A
Cited
US2468483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |