Patent US3151619A successfully refreshed from Google Patents.
US3521794A
Expired / Lapsed
US
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Ammonia pump
Assignee: GAF Corp
•
Filing: 1967-08-01
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Granted: 1970-07-28
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Expires: 1987-08-01
Abstract
No abstract record available.
Inventors
- 👤 Dingeman Bijl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:15
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/12; F04B17/00; F04B17/03; F04B17/04; F04B17/046; G; G03; G03D; G03D3/00; G03D3/02; G03D3/06; G03D7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2804241A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |