Patent US3820629A successfully refreshed from Google Patents.
Patent US4981823A successfully refreshed from Google Patents.
Patent US2857606A successfully refreshed from Google Patents.
US2857606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wall cleaning device
Assignee: Individual
•
Filing: 1956-07-13
•
Granted: 1958-10-28
•
Expires: 1976-07-13
Abstract
No abstract record available.
Inventors
- 👤 Sperka Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:32
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/40; A47L11/4013; A47L11/4016; A47L11/4022; A47L11/38; A47L11/4036; A47L11/4041; A47L11/4052; A47L11/4058; A47L11/4063; A47L11/4069; A47L11/408
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2028090A
Cited
US2239183A
Cited
US2142605A
Cited
US2187585A
Cited
US2257391A
Cited
US2335491A
Cited
US2350342A
Cited
US2587627A
Cited
US2744403A
Cited
US2665439A
Cited
DE851472C
Cited
US2642601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |