US3423767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swimming pool cover
Assignee: Ethyl Corp
•
Filing: 1967-01-30
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Granted: 1969-01-28
•
Expires: 1987-01-30
Abstract
No abstract record available.
Inventors
- 👤 Hubert D Crook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:29
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/06; E04H4/10; E04H4/108
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |