Patent US3274076A successfully refreshed from Google Patents.
US3274076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractionating stills
Assignee: Vitamins Ltd
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Filing: 1963-02-19
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Granted: 1966-09-20
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Expires: 1983-02-19
Abstract
No abstract record available.
Inventors
- 👤 Watt Peter Ridgway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:20
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/12; B01D3/14; B01D3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A MOLECULAR FRACTIONATING STILL, COMPRISING A STATIONARY CONVEX FIRST HEAT TRANSFER SURFACE SURROUNDED BY A STATIONARY CONCAVE SECOND HEAT TRANSFER SURFACE, ONE OF SAID SURFACES BEING A SURFACE OF A COOLABLE CONDENSER AND THE OTHER OF SAID SURFACE BEING A SURFACE OF A HEATABLE EVAPORATOR, SAID SURFACE BEING SURFACES OF REVOLUTION ABOUT THE SAME VERTICAL AXIS, AT LEAST ONE LIQUID TRANSFER ELEMENT MOUNTED FOR ROTATION ABOUT SAID AXIS BETWEEN
Claim 2
Dependent Claim
69 words
A MOLECULAR FRACTIONATING STILL, COMPRISING A STATIONARY CONVEX FIRST HEAT TRANSFER SURFACE SURROUNDED BY A STATIONARY CONCAVE SECOND HEAT TRANSFER SURFACE, ONE OF SAID SURFACES BEING A SURFACE OF A COOLABLE CONDENSER AND THE OTHER OF SAID SURFACE BEING A SURFACE OF A HEATABLE EVAPORATOR, SAID SURFACE BEING SURFACES OF REVOLUTION ABOUT THE SAME VERTICAL AXIS, AT LEAST ONE LIQUID TRANSFER ELEMENT MOUNTED FOR ROTATION ABOUT SAID AXIS BETWEEN
References Cited (Backward Citations)
US3020211A
Cited
US2993842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |