Patent US3537123A successfully refreshed from Google Patents.
US3537123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning device with interchangeable head
Assignee: Individual
•
Filing: 1968-08-16
•
Granted: 1970-11-03
•
Expires: 1988-08-16
Abstract
No abstract record available.
Inventors
- 👤 Ragnvald G Leland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:43
CPC Classifications
A; A47; A47L; A47L13/00; A47L13/10; A47L13/28; A47L13/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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CH133424A
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US1897726A
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GB360301A
Cited
US2011974A
Cited
US2029426A
Cited
US2279559A
Cited
US2262334A
Cited
US2560008A
Cited
US2809476A
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US3395415A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |