US1329668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal exhaust-fan
Assignee: Individual
•
Filing: 1917-07-02
•
Granted: 1920-02-03
•
Expires: 1937-07-02
Abstract
No abstract record available.
Inventors
- 👤 Charles M Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:33
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/281; F04D29/282; F04D29/283
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) | 1923-02-02 | 1923-08-04 | 1924-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-02-02 | 1927-08-04 | 1928-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-02-02 | 1931-08-04 | 1932-02-03 | $7700.00 | Window Closed / Lapsed |