US3561186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of evacuating hollow bodies
Assignee: Individual
•
Filing: 1968-04-17
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Granted: 1971-02-09
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Expires: 1988-04-17
Abstract
Abstract A METHOD OF CREATING A VACUUM WITHIN A SEALED, HOLLOW BODY SUCH AS FLEXIBLE PLASTIC TUBING WHICH INCLUDES (1) PURGING THE TUBING OF AIR BY BLOWING A STREAM OF HELIUM THROUGH THE IOPEN ENDS OF THE TUBING, THEN (2) SEALING THE OPPOSITE ENDS OF THE TUBING TO ENTRAP HELIUM THEREIN AND THEN (3) STORING THE HELIUM-FILLED, SEALED TUBING IN AN ATMOSPHERE OF AIR SO AS TO PERMIT THE HELIUM TO PASS OUTWARDLY THROUGH THE WALLS OF THE TUBING WITHOUT BEING REPLACED BY AIR, THEREBY CREATING A VACUUM CONDITION WITHIN THE INTERIOR OF THE TUBING WHICH REMAINS UNTIL THE SEAL IS BROKEN AND WHICH CAUSES THE SEALED TUBING TO COLLAPSE.
Inventors
- 👤 Donald E Pickering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:53
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/505; B65; B65B; B65B31/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |