US3779927A
Expired / Lapsed
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Heat transfer agent composition
Assignee: Dow Chemical Co
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Filing: 1971-04-26
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Granted: 1973-12-18
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Expires: 1991-04-26
Abstract
Abstract Amine-initiated copolymers of ethylene oxide and propylene oxide containing a small but effective amount of an alkaline pH buffering agent are effective heat transfer agents in the removal of excess solder from electronic circuit boards.
Inventors
- 👤 E Howell
- 👤 H Wood
- 👤 R Sayad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:50
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/26; C08G65/2618; C08G65/2621; C08K; C08K3/00; C08K3/10; C08K3/105; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
23 words
The composition defined in claim 1 wherein from about 60-80 percent by weight of the copolymer is due to the ethylene oxide moiety.
Claim 2
Dependent Claim
23 words
The composition defined in claim 1 wherein from about 70-80 percent by weight of the copolymer is due to the ethylene oxide moiety.
Claim 3
Dependent Claim
20 words
The composition defined by claim 1 wherein a has an average molecular weight of from about 1,000 to about 5,000.
Claim 4
Dependent Claim
20 words
The composition defined by claim 4 wherein a has an average molecular weight of from about 2,500 to about 4,000.
Claim 5
Dependent Claim
24 words
The composition defined by claim 1 wherein b is an alkali metal carbonate, phosphate, borate, acetate, propionate, oxalate, malonate, succinate, phthalate, citrate or tartrate.
Claim 6
Dependent Claim
15 words
The composition defined by claim 1 wherein b is an alkali metal carbonate or phosphate.
Claim 7
Dependent Claim
12 words
The composition defined by claim 7 wherein b is Na3PO4 or K3PO4.
Claim 8
Dependent Claim
22 words
The composition defined by claim 1 wherein b is present in amounts up to about 5 percent by weight, total weight basis.
Claim 9
Dependent Claim
29 words
The composition defined by claim 3 wherein b is potassium phosphate and is present in an amount of from about 0.4 to 0.5 percent by weight, total weight basis.
Claim 10
Dependent Claim
22 words
The composition defined by claim 7 where b is present in amounts up to about 5 percent by weight, total weight basis.
Claim 11
Dependent Claim
29 words
The composition defined by claim 1 wherein b is present in amounts up to about 5 percent by weight, total weight basis, and is sodium phosphate or potassium phosphate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |