US2649843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double diaphragm unit
Assignee: Phillips Petroleum Co
•
Filing: 1947-08-14
•
Granted: 1953-08-25
•
Expires: 1967-08-14
Abstract
No abstract record available.
Inventors
- 👤 John H Province
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:06
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/28; F15; F15B; F15B15/00; F15B15/08; F15B15/10; F16D25/00; F16D25/12; F16D25/14; F16D48/00; F16D48/02; F16D48/04; F16D2048/0212
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US381571A
Cited
GB190220570A
Cited
US859737A
Cited
US917642A
Cited
US1416210A
Cited
US1936602A
Cited
US2182289A
Cited
US2210917A
Cited
US2261444A
Cited
US2379291A
Cited
US2491087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |