Patent US2812155A successfully refreshed from Google Patents.
US2812155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Venetian blind cleaner
Assignee: HAROLD B PEARSON
•
Filing: 1952-11-18
•
Granted: 1957-11-05
•
Expires: 1972-11-18
Abstract
No abstract record available.
Inventors
- 👤 Oscar G Woodruff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:27
CPC Classifications
A; A47; A47L; A47L4/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US628505A
Cited
US807435A
Cited
US863257A
Cited
US1078185A
Cited
US1575242A
Cited
US2000930A
Cited
US2246036A
Cited
GB547777A
Cited
US2471109A
Cited
US2683276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |