US2956734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner head assembly
Assignee: Doyle Vacuum Cleaner Co
•
Filing: 1953-08-27
•
Granted: 1960-10-18
•
Expires: 1973-08-27
Abstract
No abstract record available.
Inventors
- 👤 Dewey I Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:27
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; A47L5/36; A47L5/365
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1707401A
Cited
US1920672A
Cited
US2114780A
Cited
US2162396A
Cited
US2280495A
Cited
US2565269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |