US1729074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Humidifying system
Assignee: Parks Cramer Co
•
Filing: 1928-03-05
•
Granted: 1929-09-24
•
Expires: 1948-03-05
Abstract
No abstract record available.
Inventors
- 👤 Alfred F Karlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:26
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F3/14
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) | 1932-09-23 | 1933-03-25 | 1933-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-09-23 | 1937-03-25 | 1937-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-09-23 | 1941-03-25 | 1941-09-24 | $7700.00 | Window Closed / Lapsed |