US2791789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brush having bristles serving as a valve
Assignee: Individual
•
Filing: 1952-11-21
•
Granted: 1957-05-14
•
Expires: 1972-11-21
Abstract
No abstract record available.
Inventors
- 👤 Delbert C Smith
- 👤 Vivian J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:28
CPC Classifications
A; A46; A46B; A46B11/00; A46B11/001; A46B11/0013; A45; A45D; A45D40/00; A45D40/26; A45D40/262; A45D40/265; A46B11/002; A46B11/0041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US376385A
Cited
US453229A
Cited
US615617A
Cited
GB190321694A
Cited
US1693329A
Cited
US1693330A
Cited
US2682070A
Cited
US2618275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-13 | 1960-11-12 | 1961-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-13 | 1964-11-12 | 1965-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-13 | 1968-11-12 | 1969-05-14 | $7700.00 | Window Closed / Lapsed |