US4091148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of impregnating concrete
Assignee: Individual
•
Filing: 1976-11-08
•
Granted: 1978-05-23
•
Expires: 1996-11-08
Abstract
Abstract A process for impregnating concrete which comprises:
Inventors
- 👤 Paul Richard Blankenhorn
- 👤 David Andrew Whiting
- 👤 Donald Edgar Kline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:20
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/46; C04B41/48; C04B41/4853; C04B41/60; C04B41/61; C04B41/62; C04B41/63; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A process for impregnating concrete which comprises: (a) partially drying said concrete to a moisture content of from about 4% to about 8% by weight, (b) impregnating said dried concrete by allowing it to absorb a liquid epoxy devoid of catalyst at elevated temperature and at atmospheric pressure, and (c) curing said epoxy resin in situ by heating said impregnated concrete to a temperature of from about 150° to about 200° C. for at least about 24 hours, using as catalyst the water remaining in said partially dried concrete.
Claim 2
Dependent Claim
89 words
A process for impregnating concrete which comprises: (a) partially drying said concrete to a moisture content of from about 4% to about 8% by weight, (b) impregnating said dried concrete by allowing it to absorb a liquid epoxy devoid of catalyst at elevated temperature and at atmospheric pressure, and (c) curing said epoxy resin in situ by heating said impregnated concrete to a temperature of from about 150° to about 200° C. for at least about 24 hours, using as catalyst the water remaining in said partially dried concrete.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the drying is carried out to a moisture content of about 4% by weight.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein curing of the impregnated concrete is carried out at about 175° C.
Claim 5
Independent Claim
101 words
A method for increasing the strength and corrosion properties of large concrete structures in the field which comprises: (a) partially drying said concrete to a moisture content of from about 4% to about 8% by weight, (b) impregnating said dried concrete by allowing it to absorb a liquid epoxy resin devoid of catalyst at elevated temperature and at atmospheric pressure, and (c) curing said epoxy resin in situ by heating said impregnated concrete to a temperature of from about 150° to about 200° C. for at least about 24 hours, using as catalyst the water remaining in said partially dried concrete.
Claim 6
Independent Claim
101 words
A method for increasing the strength and corrosion properties of large concrete structures in the field which comprises: (a) partially drying said concrete to a moisture content of from about 4% to about 8% by weight, (b) impregnating said dried concrete by allowing it to absorb a liquid epoxy resin devoid of catalyst at elevated temperature and at atmospheric pressure, and (c) curing said epoxy resin in situ by heating said impregnated concrete to a temperature of from about 150° to about 200° C. for at least about 24 hours, using as catalyst the water remaining in said partially dried concrete.
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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) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |