US3304731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High vacuum cold trap
Assignee: Granville Phillips Co
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Filing: 1964-03-13
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Granted: 1967-02-21
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Expires: 1984-03-13
Abstract
No abstract record available.
Inventors
- 👤 Daniel G Bills
- 👤 Keith A Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:37
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/006; F; F04; F04B; F04B37/00; F04B37/06; F04B37/08; F04F; F04F9/00; F04F9/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
187 words
A COLD TRAP FOR USE BETWEEN A DIFFUSION PUMP AND A CLOSED SYSTEM TO BE EVACUATED THEREBY WHICH COMPRISES: A GAS-IMPERVIOUS SHELL HAVING SIDEWALLS FORMING A GAS FLOW PASSAGE THERETHROUGH WITH AN INLET OPENING IN THE TOP FOR CONNECTION TO A SYSTEM AND AN OUTLET OPENING IN THE BOTTOM FOR CONNECTION TO A PUMP; A COOLANT RESERVOIR HAVING INNER AND OUTER WALLS SURROUNDING SAID SHELL WITH THAT PORTION OF THE INNER WALL OF THE COOLANT RESERVOIR SURROUNDING THE LOWER PORTION OF SAID FLOW PASSAGE BEING CONTIGUOUS WITH THE LOWER PORTION OF SAID SHELL SIDEWALLS WHICH DEFINE A LOWER CONTIGUOUS WALL PORTION WHILE THAT PORTION OF THE INNER WALL OF THE COOLANT RESERVOIR SURROUNDING THE UPPER PORTION OF THE FLOW PASSAGE IS SPACED FROM THE UPPER PORTION OF SAID SHELL SIDEWALLS WHICH DEFINE AN UPPER SPACED WALL PORTION SERIALLY CONNECTED TO SAID CONTIGUOUS WALL PORTION, SAID COOLANT RESERVOIR BEING OF A CONFIGURATION AND HAVING A NORMAL COOLANT LEVEL SUCH THAT THE MAJOR PORTION OF THE COOLANT VOLUME IS LOCATED ABOVE THE JUNCTION BETWEEN THE LOWER CONTIGUOUS WALL PORTION AND THE UPPER SPACED WALL PORTION OF SAID FLOW PASSAGE,
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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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |