Patent US4136774A successfully refreshed from Google Patents.
US4136774A
Expired / Lapsed
US
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Rock bolt resins
Assignee: Rexnord Inc
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Filing: 1977-12-22
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Granted: 1979-01-30
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Expires: 1997-12-22
Abstract
Abstract A two pocket rock bolt resin package containing, in one pocket, a polyester together with sodium bicarbonate and calcium carbonate and, in a second pocket, a curing agent, water and a weak acid.
Inventors
- 👤 Ramkrishna Ghoshal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:25
CPC Classifications
E; E21; E21D; E21D20/00; E21D20/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
A two pocket package of resin and curing agent comprising, in one pocket, a linear pre-polymer polyester reaction constituent, capable of being crosslinked and thereby cured to a thermoset state, together with sodium bicarbonate and a calcium carbonate filler; and, in a second pocket, a curing agent for the resin, which starts the reaction, together with water and an acid which is stronger than carbonic acid, that is, Ka >4.5 × 10 -7 , but non-reactive with the curing agent.
Claim 2
Dependent Claim
80 words
A two pocket package of resin and curing agent comprising, in one pocket, a linear pre-polymer polyester reaction constituent, capable of being crosslinked and thereby cured to a thermoset state, together with sodium bicarbonate and a calcium carbonate filler; and, in a second pocket, a curing agent for the resin, which starts the reaction, together with water and an acid which is stronger than carbonic acid, that is, Ka >4.5 × 10 -7 , but non-reactive with the curing agent.
Claim 3
Dependent Claim
28 words
A package according to claim 1 in which the acid is selected from the group consisting of citirc acid, acetic acid, tartaric acid, glutaric acid and malonic acid.
Claim 4
Dependent Claim
32 words
A package according to claim 2 in which the following range previals, based on approximately two hundred parts by weight resin constituent and filler: sodium bicarbonate, 10/20 water, 0.5/2 citric acid, 0.5/2
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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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |