US3483884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back flow prevention system
Assignee: Sullivan Valve & Eng Co
•
Filing: 1967-08-21
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Granted: 1969-12-16
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Expires: 1987-08-21
Abstract
No abstract record available.
Inventors
- 👤 Timothy J Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:31
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/106; E03C1/108; F; F16; F16K; F16K15/00; F16K15/18; F16K15/182; F16K15/1821; F16K15/184; F16K15/1841; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/7722; Y10T137/7781; Y10T137/7783; Y10T137/7832; Y10T137/7837; Y10T137/7838; Y10T137/7842
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) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |