Patent US2985245A successfully refreshed from Google Patents.
US2985245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller fan
Assignee: NATIONAL FROST PROTECTION CO Inc
•
Filing: 1958-08-01
•
Granted: 1961-05-23
•
Expires: 1978-08-01
Abstract
No abstract record available.
Inventors
- 👤 Ralph P Maloof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:17
CPC Classifications
F; F03; F03D; F03D1/00; F03D1/06; F03D1/065; F03D1/0658; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1463556A
Cited
US2317502A
Cited
US2395193A
Cited
US2492029A
Cited
US2620039A
Cited
US2845131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |