Patent US3355529A successfully refreshed from Google Patents.
US3355529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming post tensioned concrete liners in conduits
Assignee: Individual
•
Filing: 1965-06-24
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Granted: 1967-11-28
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Expires: 1985-06-24
Abstract
No abstract record available.
Inventors
- 👤 Joan L Easterday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:53
CPC Classifications
F; F16; F16L; F16L41/00; F16L41/002; F16L41/08; F16L9/00; F16L9/14; F16L9/153
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A METHOD OF FORMING POST TENSIONED CONCRETE LINERS IN EXISTING CONDUIT COMPRISING THE STEPS OF APPLYING A THIN COATING OF CEMENTITIOUS MATERIAL TO THE INTERNAL SURFACE OF THE CONDUIT SECURING A STRESS BEARING MEMBER BY SAID CEMENTITIOUS MATERIAL TO SAID CONDUIT, SUPPORTING STRESSING WIERES AROUND THE INTERIOR OF SAID CONDUIT WITH THE ENDS THEREOF EXTENDING INTO SAID STRESS BEARING MEMBER, FORMING A LAYER OF CONCRETE AROUND SAID STRESSING
Claim 2
Independent Claim
68 words
A METHOD OF FORMING POST TENSIONED CONCRETE LINERS IN EXISTING CONDUIT COMPRISING THE STEPS OF APPLYING A THIN COATING OF CEMENTITIOUS MATERIAL TO THE INTERNAL SURFACE OF THE CONDUIT SECURING A STRESS BEARING MEMBER BY SAID CEMENTITIOUS MATERIAL TO SAID CONDUIT, SUPPORTING STRESSING WIERES AROUND THE INTERIOR OF SAID CONDUIT WITH THE ENDS THEREOF EXTENDING INTO SAID STRESS BEARING MEMBER, FORMING A LAYER OF CONCRETE AROUND SAID STRESSING
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) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |