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Patent US3556760A successfully refreshed from Google Patents.
US3556760A
Expired / Lapsed
US
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Apparatus for heat sealing evacuated glass ampules
Assignee: Virtis Co Inc
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Filing: 1968-06-28
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Granted: 1971-01-19
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Expires: 1988-06-28
Abstract
Abstract AN APPARATUS FOR AUTOMATICALLY HEAT SEALING AMPULES WHICH HAS MEANS TO ROTATE THE AMPULE ABOUT AN AXIS, MEANS TO HEAT THE AMPULE FOR A TIMED PERIOD, AND MEANS FOR CONTINUOUSLY APPLYING OPPOSITELY DIRECTED FORCES ON SAID AMPULE ALONG THE AXIS WITHOUT TORSIONAL RESTRAINT. THE FORCES ARE APPLIED WHILE THE AMPULE IS ROTATED AND HEATED, TO CAUSE AXIAL SEPARATION OF THE AMPULE WHILE MAINTAINING THE AMPULE IN EVACUATED CONDITION. THERE IS A SECOND HEATING MEANS FOR ANNEALING THE AMPULE IN THE REGION OF SEPARATION.
Inventors
- 👤 Charles E Bender
- 👤 Taylor Norris Thompson
- 👤 Douglas S Fraser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:59
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/18
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |