US3138937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a gas-tight seal between a pair of adjacent sections of a freeze-drying container
Assignee: Virtis Co Inc
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Filing: 1963-01-21
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Granted: 1964-06-30
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Expires: 1983-01-21
Abstract
No abstract record available.
Inventors
- 👤 Martin C Parkinson
- 👤 Charles E Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:20
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A METHOD OF PRODUCING A GAS TIGHT SEAL BETWEEN A PAIR OF ADJACENT SECTIONS OF A FREEZE DRYING CONTAINER WHILE SAID CONTAINER IS UTILIZED IN CONNECTION WITH A PROCESS OF FREEZE DRYING, COMPRISING THE STEPS OF PREPARING A CONTAINER HAVING A PAIR OF OPPOSABLE HOLLOW SECTIONS, PLACING A SEALING MEMBER FORMED OF A SILICONE RUBBER HAVING A DUROMETER OF FROM 40 TO 80 BETWEEN SAID SECTIONS WHILE SAID CONTAINER IS AT ROOM TEMPERATURE AND ATMOSPHERIC PRESSURE, PLACING SAID CONTAINER IN OPERATIVE RELATIONSHIP WITH A SOURCE OF VACUUM AND OF LOW TEMPERATURE, EVACUATING THE AIR FROM SAID CONTAINER AND LOWERING THE TEMPERATURE TO PRODUCE A TEMPERATURE OF AT LEAST -70*C. AND A VACUUM OF AT LEAST ONE MICRON, WHEREBY THE SEALING MEMBER FLOWS OVER THE OPPOSED EDGES OF THE CONTAINER SECTIONS.
Claim 2
Independent Claim
130 words
A METHOD OF PRODUCING A GAS TIGHT SEAL BETWEEN A PAIR OF ADJACENT SECTIONS OF A FREEZE DRYING CONTAINER WHILE SAID CONTAINER IS UTILIZED IN CONNECTION WITH A PROCESS OF FREEZE DRYING, COMPRISING THE STEPS OF PREPARING A CONTAINER HAVING A PAIR OF OPPOSABLE HOLLOW SECTIONS, PLACING A SEALING MEMBER FORMED OF A SILICONE RUBBER HAVING A DUROMETER OF FROM 40 TO 80 BETWEEN SAID SECTIONS WHILE SAID CONTAINER IS AT ROOM TEMPERATURE AND ATMOSPHERIC PRESSURE, PLACING SAID CONTAINER IN OPERATIVE RELATIONSHIP WITH A SOURCE OF VACUUM AND OF LOW TEMPERATURE, EVACUATING THE AIR FROM SAID CONTAINER AND LOWERING THE TEMPERATURE TO PRODUCE A TEMPERATURE OF AT LEAST -70*C. AND A VACUUM OF AT LEAST ONE MICRON, WHEREBY THE SEALING MEMBER FLOWS OVER THE OPPOSED EDGES OF THE CONTAINER SECTIONS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |