US2719348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of reinforced asbestos-cement pipes
Assignee: FRANCAISE ETERNIT SA
•
Filing: 1952-03-28
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Granted: 1955-10-04
•
Expires: 1972-03-28
Abstract
No abstract record available.
Inventors
- 👤 Desnos Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:17
CPC Classifications
B; B28; B28B; B28B19/00; B28B19/0023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PROCESS FOR MANUFACTURING OF COMPOSITE PIPES, COMPRISING MAKING A PIPE OF ASBESTOS CEMENT, DRYING SAID PIPE, INTRODUCING FLUID CONCRETE INTO SAID PIPE, CENTRIFUGING SAID PIPE WITH SAID FLUID CONCRETE THEREIN TO EXPAND THE ASBESTOS CEMENT OF SAID PIPE AND FORCE THE FLUID CONCRETE INTO INTIMATE CONTACT THEREWITH, CONTINUING SAID CENTRIFUGING UNTIL THE CEMENT HAS SET, AND REMOVING SAID PIPE FROM CENTRIFUGAL ACTION TO CONTRACT THE ASBESTO CEMENT OF SAID PIPE AND COMPRESS THE INNER CONCRETE COATING.
Claim 2
Dependent Claim
77 words
A PROCESS FOR MANUFACTURING OF COMPOSITE PIPES, COMPRISING MAKING A PIPE OF ASBESTOS CEMENT, DRYING SAID PIPE, INTRODUCING FLUID CONCRETE INTO SAID PIPE, CENTRIFUGING SAID PIPE WITH SAID FLUID CONCRETE THEREIN TO EXPAND THE ASBESTOS CEMENT OF SAID PIPE AND FORCE THE FLUID CONCRETE INTO INTIMATE CONTACT THEREWITH, CONTINUING SAID CENTRIFUGING UNTIL THE CEMENT HAS SET, AND REMOVING SAID PIPE FROM CENTRIFUGAL ACTION TO CONTRACT THE ASBESTO CEMENT OF SAID PIPE AND COMPRESS THE INNER CONCRETE COATING.
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) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |