US4698173A
Expired / Lapsed
US
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Deicing compositions
Assignee: Individual
•
Filing: 1986-11-24
•
Granted: 1987-10-06
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Expires: 2006-11-24
Abstract
Abstract A deicing material which is not corrosive to reinforcing steel or aluminum in overpasses and bridges consists essentially of ammonium carbamate and may be combined with urea production by-products or certain alkalis.
Inventors
- 👤 Charles N. Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:41
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18; C09K3/185
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
31 words
A deicing composition consisting essentially of ammonium carbamate and urea in granular form in the range of proportions by weight of 99.5% to 4% ammonium carbamate and 0.5% to 96% urea.
Claim 2
Dependent Claim
31 words
A deicing composition consisting essentially of ammonium carbamate and urea in granular form in the range of proportions by weight of 99.5% to 4% ammonium carbamate and 0.5% to 96% urea.
Claim 3
Dependent Claim
20 words
The composition of claim 1, in which the composition is in granular form with particles in the range of 1/20"-1/4".
Claim 4
Dependent Claim
23 words
The composition of claim 1, in which the composition is in granular form with particles in the range of twenty mesh to 1/4".
Claim 5
Dependent Claim
26 words
A deicing composition consisting essentially of ammonium carbamate and urea in granular form, in the ratio, by weight, of approximately 95% ammonium carbamate and 5% urea.
Claim 6
Dependent Claim
26 words
A deicing composition consisting essentially of ammonium carbamate and urea in granular form, in the ratio, by weight, of approximately 95% ammonium carbamate and 5% urea.
Claim 7
Dependent Claim
17 words
A deicing composition consisting essentially of ammonium carbamate and either sodium hydroxide, sodium orthosilicate or potassium hydroxide.
Claim 8
Dependent Claim
17 words
A deicing composition consisting essentially of ammonium carbamate and either sodium hydroxide, sodium orthosilicate or potassium hydroxide.
Claim 9
Dependent Claim
9 words
The composition of claim 5 in a water solution.
Claim 10
Dependent Claim
22 words
The composition of claim 5, in which the composition is in granular form with particles in the range of 1/20" to 1/4".
Claim 11
Dependent Claim
33 words
A deicing composition consisting essentially of ammonium carbamate and either sodium hydroxide or sodium orthosilicate in the proportions of one mole of ammonium carbamate to one mole of sodium hydroxide or sodium orthosilicate.
Claim 12
Dependent Claim
33 words
A deicing composition consisting essentially of ammonium carbamate and either sodium hydroxide or sodium orthosilicate in the proportions of one mole of ammonium carbamate to one mole of sodium hydroxide or sodium orthosilicate.
Claim 13
Dependent Claim
12 words
A deicing composition consisting essentially of ammonium carbamate, sodium hydroxide and urea.
Claim 14
Dependent Claim
12 words
A deicing composition consisting essentially of ammonium carbamate, sodium hydroxide and urea.
Claim 15
Dependent Claim
12 words
A deicing composition consisting essentially of ammonium carbamate, potassium hydroxide and urea.
Claim 16
Dependent Claim
12 words
A deicing composition consisting essentially of ammonium carbamate, potassium hydroxide and urea.
Claim 17
Dependent Claim
25 words
A process for melting ice comprising applying an aqueous solution consisting essentially of water and ammonium carbamate at a concentration of about 40% by weight.
Claim 18
Dependent Claim
25 words
A process for melting ice comprising applying an aqueous solution consisting essentially of water and ammonium carbamate at a concentration of about 40% by weight.
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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |