US3551981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sealingly seating an elongated object in an opening
Assignee: Gulf Research and Development Co
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Filing: 1967-10-19
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Granted: 1971-01-05
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Expires: 1987-10-19
Abstract
Abstract METHODS AND APPARATUS FOR SEALING AN ELONGATED OBJECT IN A PREPARED STEPPED OPENING WITH THE USE OF A PAIR OF NESTED SEALING MEMBERS, ONE OF WHICH EXPANDS BY MOVING WITH RESPECT TO THE OTHER TO FILL THE LARGE PART OF THE STEPPED OPENING AROUND THE OBJECT.
Inventors
- 👤 Donald K Hagar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:30
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/60; E21B10/61; F; F16; F16B; F16B2200/00; F16B2200/40; F16B2200/406; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428; Y10T29/49432; Y10T29/49826; Y10T29/49945
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |