US3448586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protected buried material and method of protecting same
Assignee: Phillips Petroleum Co
•
Filing: 1966-07-15
•
Granted: 1969-06-10
•
Expires: 1986-07-15
Abstract
No abstract record available.
Inventors
- 👤 Tyson H Mailen
- 👤 Roy E Stansbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:49
CPC Classifications
F; F16; F16L; F16L1/00; F16L1/024; F16L1/06; F16L1/11; H; H01; H01B; H01B7/00; H01B7/17; H01B7/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1829162A
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US2222638A
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US2222639A
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US2390713A
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US2598989A
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US2621143A
Cited
US2862850A
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US2941879A
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US3201944A
Cited
US3269902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |