US3041204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal conduit coating method and apparatus
Assignee: Individual
•
Filing: 1959-03-24
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Granted: 1962-06-26
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Expires: 1979-03-24
Abstract
No abstract record available.
Inventors
- 👤 Leland W Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:14
CPC Classifications
B; B05; B05C; B05C7/00; B05C7/06; B05C7/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
131 words
THE METHOD OF COATING THE INTERIOR OF A CONDUIT, WHICH COMPRISES ENTRAPPING A FLUID BODY BETWEEN A FIRST PAIR OF RESILIENT, SPACED AND CONNECTED HOLLOW, CONDUITENGAGING SPHERES, AND A SECOND PAIR OF RESILENT, SPACED ENGAGING SPHERES, AND A SECOND PAIR OF RESILIENT, SPACED AND CONNECTED, HOLLOW CONDUIT-ENGAGING SPHERES, PROVIDING AND MAINTAINING INTERNAL PRESSURE IN THE SPHERES OF SAID FIRST PAIR AND THE LEADING SPHERE OF SAID SECOND PAIR, MOVING SAID PAIRS OF SPHERES AND SAID FLUID BODY BY APPLYING FLUID PRESSURE BEHIND SAID SECOND PAIR, AND MAINTAINING BACK PRESSURE AGAINST THE LEADING SPHERE OF SAID FIRST PAIR BY PROVIDING A CLOSURE IN THE CONDUIT AHEAD OF THE LEADING SPHERE AND VENTING AIR FROM THE SPACE IN THE CONDUIT BETWEEN THE LEADING SPHERE AND THE CLOSURE AT A CONSTANT RATE OF FLOW.
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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) | 1965-06-25 | 1965-12-25 | 1966-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-25 | 1969-12-25 | 1970-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-25 | 1973-12-25 | 1974-06-26 | $7700.00 | Window Closed / Lapsed |