US5277835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment agent for fine surface treatment
Assignee: Stella Chemifa Corp
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Filing: 1993-04-21
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Granted: 1994-01-11
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Expires: 2013-04-21
Abstract
Abstract A surface treatment agent containing a solution of hydrogen fluoride, ammonium fluoride and water, the solution containing less than 8 weight % of hydrogen fluoride (HF) and less than 15 weight % of ammonium fluoride (NH4F).
Inventors
- 👤 Tadahiro Ohmi
- 👤 Masahiro Miki
- 👤 Hirohisa Kikuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:54
CPC Classifications
H; H10; H10P; H10P95/00; C; C09; C09K; C09K13/00; C09K13/04; C09K13/08; H10P70/00; H10P70/20; H10P70/23; H10P70/234
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
49 words
A surface treatment agent comprising an aqueous solution containing 0.01 to 8 weight % of hydrogen fluoride, 0.01-10 weight % of ammonium fluoride, said aqueous solution further containing at least one member of the group consisting of aliphatic carboxylic acids, aliphatic carboxylic acid salts, aliphatic amines and aliphatic alcohols.
Claim 2
Dependent Claim
49 words
A surface treatment agent comprising an aqueous solution containing 0.01 to 8 weight % of hydrogen fluoride, 0.01-10 weight % of ammonium fluoride, said aqueous solution further containing at least one member of the group consisting of aliphatic carboxylic acids, aliphatic carboxylic acid salts, aliphatic amines and aliphatic alcohols.
Claim 3
Dependent Claim
23 words
The surface treatment agent of claim 1, wherein said member is an aliphatic amine and at least one other member of said group.
References Cited (Backward Citations)
US3650960A
Cited
US3671437A
Cited
US3966473A
Cited
US3920471A
Cited
US4040897A
Cited
US4125427A
Cited
US4198262A
Cited
US4517106A
Cited
US4795582A
Cited
US4921572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-10 | 1997-07-12 | 1998-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-10 | 2001-07-12 | 2002-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-10 | 2005-07-12 | 2006-01-11 | $7700.00 | Window Closed / Lapsed |