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Patent US3434935A successfully refreshed from Google Patents.
US3434935A
Expired / Lapsed
US
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Apparatus for vacuum and short-path distillation
Assignee: Leybold Heraeus Verwaltung GmbH
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Filing: 1968-03-29
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Granted: 1969-03-25
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Expires: 1988-03-29
Abstract
No abstract record available.
Inventors
- 👤 Richard Habendorff
- 👤 Willi Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:39
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB330805A
Cited
GB656605A
Cited
US2955990A
Cited
DE1068219B
Cited
US3054729A
Cited
US2993842A
Cited
US3004901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |