US2828769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid or gas capacitor
Assignee: WATERMAN ENGINEERING Corp
•
Filing: 1954-12-20
•
Granted: 1958-04-01
•
Expires: 1974-12-20
Abstract
No abstract record available.
Inventors
- 👤 Roy L Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:13
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; F15B1/04; F15B1/08; F15B1/10; F15B1/103; F16; F16L; F16L55/00; F16L55/04; F16L55/045; F16L55/05; F16L55/052; F15B2201/00; F15B2201/20; F15B2201/205; F15B2201/30; F15B2201/315; F15B2201/3153; F15B2201/40; F15B2201/41; F15B2201/411; F15B2201/413; F15B2201/415; F15B2201/4155; F15B2201/50; F15B2201/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US381731A
Cited
US1561065A
Cited
US1661131A
Cited
US1875732A
Cited
US2401792A
Cited
US2411315A
Cited
US2682893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |