US3000508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner attachment for swimming pool skimmer
Assignee: Refinite Corp
•
Filing: 1956-12-13
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Granted: 1961-09-19
•
Expires: 1976-12-13
Abstract
No abstract record available.
Inventors
- 👤 Charles A Spaulding
- 👤 Merle E Oberholtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:01
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/12; E04H4/1209; E04H4/1272; E04H4/14; E04H4/16; E04H4/1618; E04H4/1636; E04H4/1645
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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |