Patent US3417686A successfully refreshed from Google Patents.
US3417686A
Expired / Lapsed
US
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Variable volume high pressure ammonia development device
Assignee: International Business Machines Corp
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Filing: 1965-12-03
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Granted: 1968-12-24
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Expires: 1985-12-03
Abstract
No abstract record available.
Inventors
- 👤 Jack O Hildebrand
- 👤 Richard B Mulvany
- 👤 Perrin F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:20
CPC Classifications
G; G03; G03D; G03D7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2665619A
Cited
US3229608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |