US3481428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder construction
Assignee: Coast Manufacturing and Supply Co
•
Filing: 1968-01-25
•
Granted: 1969-12-02
•
Expires: 1988-01-25
Abstract
No abstract record available.
Inventors
- 👤 James A Merritt
- 👤 James A Wedin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:41
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/04; E06C1/08; E06C1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2552630A
Cited
US3318413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |