US2937713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner
Assignee: US Hoffman Machinery Corp
•
Filing: 1957-01-11
•
Granted: 1960-05-24
•
Expires: 1977-01-11
Abstract
No abstract record available.
Inventors
- 👤 Revis L Stephenson
- 👤 Elias H Dewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:15
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/16; A47L9/165; A47L9/1608; E; E01; E01H; E01H1/00; E01H1/08; E01H1/0827; E01H1/0836
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US514677A
Cited
GB344274A
Cited
DE334976C
Cited
US1015637A
Cited
US1252905A
Cited
US1124603A
Cited
US1229737A
Cited
US1933730A
Cited
US1944976A
Cited
US2114786A
Cited
US2131398A
Cited
US2349831A
Cited
US2523808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |