US3478370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swimming pool step construction with integral vinyl liner
Assignee: ROSARIO A PURPURI
•
Filing: 1968-01-19
•
Granted: 1969-11-18
•
Expires: 1988-01-19
Abstract
No abstract record available.
Inventors
- 👤 Robert Stern
- 👤 Rosario A Purpuri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:11
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/104; E04F11/16; E04H; E04H4/00; E04H4/14; E04H4/144; E04H2004/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1051753A
Cited
US1676317A
Cited
US1812504A
Cited
US3015191A
Cited
US3290839A
Cited
US3374491A
Cited
US3236012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |