Patent US2198230A successfully refreshed from Google Patents.
US2198230A
Expired / Lapsed
US
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Spirometer
Assignee: WARREN E COLLINS Inc
•
Filing: 1938-05-20
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Granted: 1940-04-23
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Expires: 1958-05-20
Abstract
No abstract record available.
Inventors
- 👤 Herman P Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:52
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/091; A61B5/093; A61B5/0935
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-04-23 | 1943-10-23 | 1944-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-23 | 1947-10-23 | 1948-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-23 | 1951-10-23 | 1952-04-23 | $7700.00 | Window Closed / Lapsed |