US3438442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-temperature packer
Assignee: Shell USA Inc
•
Filing: 1966-07-29
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Granted: 1969-04-15
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Expires: 1986-07-29
Abstract
No abstract record available.
Inventors
- 👤 John A Pryor
- 👤 Chester J Frazier Jr
- 👤 Lawrence L Smith
- 👤 John A Stanzione
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:47
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/003
Claims Analysis
Total Claims: 0
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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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |