US2898171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Weatherhead Co
•
Filing: 1956-09-24
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Granted: 1959-08-04
•
Expires: 1976-09-24
Abstract
No abstract record available.
Inventors
- 👤 Clayton J Ehlert
- 👤 Edmund T Duffy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:03
CPC Classifications
A; A47; A47F; A47F3/00; A47F3/06; A47F3/063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1352101A
Cited
US1756880A
Cited
US1591774A
Cited
US1617799A
Cited
US2176913A
Cited
US2462330A
Cited
US2576508A
Cited
US2692808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |