Patent US2835831A successfully refreshed from Google Patents.
Patent US3487934A successfully refreshed from Google Patents.
US3487934A
Expired / Lapsed
US
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Swimming pool filter and heater device
Assignee: ROBERT J SEYLER
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Filing: 1968-04-15
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Granted: 1970-01-06
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Expires: 1988-04-15
Abstract
No abstract record available.
Inventors
- 👤 Robert J Seyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:21
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/10; B01D24/14; B01D35/00; B01D35/18; E; E04; E04H; E04H4/00; E04H4/12
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) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |