US2610875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extension ladder
Assignee: Individual
•
Filing: 1948-03-26
•
Granted: 1952-09-16
•
Expires: 1968-03-26
Abstract
No abstract record available.
Inventors
- 👤 Harry L Wheelden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:38
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/04; E06C1/08; E06C1/12; E06C1/125; Y; Y10; Y10T; Y10T292/00; Y10T292/175; Y10T292/18; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32426; Y10T403/32467; Y10T403/32475; Y10T403/32483; Y10T403/59; Y10T403/591; Y10T403/593; Y10T403/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US346575A
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US514020A
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US575759A
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US657932A
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US700343A
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US783773A
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US839297A
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US918062A
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US1595450A
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US2363520A
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US2380632A
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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) | 1955-09-16 | 1956-03-17 | 1956-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-16 | 1960-03-17 | 1960-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-16 | 1964-03-17 | 1964-09-16 | $7700.00 | Window Closed / Lapsed |