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 06:49
CPC Classifications
A; A47; A47L; A47L13/00; A47L13/10; A47L13/28; A47L13/29
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USRE20657E
Cited
US672584A
Cited
US1297076A
Cited
CH133424A
Cited
US1897726A
Cited
GB360301A
Cited
US2011974A
Cited
US2029426A
Cited
US2279559A
Cited
US2262334A
Cited
US2560008A
Cited
US2809476A
Cited
US3395415A
Cited
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 |