Patent US3591394A successfully refreshed from Google Patents.
US3591394A
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US
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Method of production of injection mortar or porous concrete
Assignee: Sika Schweiz AG
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Filing: 1968-02-27
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Granted: 1971-07-06
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Expires: 1988-02-27
Abstract
Abstract THE METHOD FOR PRODUCING INJECTION MORTAR OR POROUS CONCRETE COMPRISES ADDING TO A CEMENT CONTAINING MIXTURE A NITROGEN DELIVERING COMPOUND IN AN AMOUNT OF OF 0.1% TO 6% OF THE WEIGHT OF THE CEMENT CAUSING AN EXPANSION OR FORMATION OF PORES IN SAID MIXTURE. THE NITROGEN DELIVERING COMPOUND PREFERABLY WILL BE A HYDRAZINE DERIVATIVE, SUCH AS HYDRAZINE SULFATE OR DIHYDRAZINE SULFATE, OR A BENZENE-SULFOHYDRAZINE, A STABILISED DIAZONIUM SALT, OR A DIAZOTIZED NITRO-ANILINE, AND AN ACTIVATOR FOR THE NITROGEN DELIVERING COMPOUND MAY ADDED.
Inventors
- 👤 Kurt Diggelmann
- 👤 Robert Serena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:34
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; C04B22/00; C04B22/08; C04B22/14; C04B22/142; C04B24/00; C04B24/12; C04B24/16; C04B24/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |