US3381312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning system
Assignee: DEAN K WHITLA
•
Filing: 1965-11-29
•
Granted: 1968-05-07
•
Expires: 1985-11-29
Abstract
No abstract record available.
Inventors
- 👤 Dean K Whitla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:35
CPC Classifications
E; E03; E03D; E03D9/00; E03D9/002; A; A47; A47K; A47K3/00; A47K3/28; A47K3/281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1687711A
Cited
US1958940A
Cited
US2605478A
Cited
US3037223A
Cited
US3035293A
Cited
US2870457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |