Patent US4207873A successfully refreshed from Google Patents.
Patent US2753808A successfully refreshed from Google Patents.
US2753808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal impeller
Assignee: Individual
•
Filing: 1950-02-15
•
Granted: 1956-07-10
•
Expires: 1970-02-15
Abstract
No abstract record available.
Inventors
- 👤 Kluge Dorothea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:25
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/284; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/141; F01D5/145; F04D29/18; F04D29/22; F04D29/24; F04D29/242; F04D29/245; F04D29/281; F04D29/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US588513A
Cited
DE375042C
Cited
DE345615C
Cited
US1622930A
Cited
US2106040A
Cited
US2165808A
Cited
GB524703A
Cited
FR889341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |