US2720469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing fluid-tight concrete
Assignee: Rocla Pipes Ltd
•
Filing: 1952-05-28
•
Granted: 1955-10-11
•
Expires: 1972-05-28
Abstract
No abstract record available.
Inventors
- 👤 Serkin Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:56
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/46; C04B41/48; C04B41/4803; C04B41/52; C04B41/60; C04B41/61; C04B41/62; C04B41/63; C04B41/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A METHOD OF TREATING FORMED CONCRETE STRUCTURES TO RENDER THEM RESISTANT TO THE PASSAGE OF GASES AND LIQUIDS THERETHROUGH, COMPRISING APPLYING TO A FORMED CONCRETE SURFACE AN AQUEOUS SOLUTION OF AN ALGINATE SELECTED FROM THE GROUP CONSISTING OF SODIUM AND AMMONIUM ALGINATES AND ALLOWING SAID APPLIED ALGINATE TO REACT WITH CALCIUM PRESENT IN THE SURFACE LAYERS OF THE CONCRETE TO FORM A SUBSTANTIALLY CONTINUOUS WATER-INSOLUBLE LAYER OF CALCIUM ALGINATE ON SAID SURFACE.
Claim 2
Independent Claim
72 words
A METHOD OF TREATING FORMED CONCRETE STRUCTURES TO RENDER THEM RESISTANT TO THE PASSAGE OF GASES AND LIQUIDS THERETHROUGH, COMPRISING APPLYING TO A FORMED CONCRETE SURFACE AN AQUEOUS SOLUTION OF AN ALGINATE SELECTED FROM THE GROUP CONSISTING OF SODIUM AND AMMONIUM ALGINATES AND ALLOWING SAID APPLIED ALGINATE TO REACT WITH CALCIUM PRESENT IN THE SURFACE LAYERS OF THE CONCRETE TO FORM A SUBSTANTIALLY CONTINUOUS WATER-INSOLUBLE LAYER OF CALCIUM ALGINATE ON SAID SURFACE.
References Cited (Backward Citations)
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Cited
US1415849A
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US1671995A
Cited
US2013651A
Cited
US2307696A
Cited
US2432688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |