Patent US3939295A successfully refreshed from Google Patents.
US3939295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective coatings and frits therefor
Assignee: VITREOUS ENAMELS Ltd WARRINGTON ENGLAND A BRITISH Co
•
Filing: 1972-12-22
•
Granted: 1976-02-17
•
Expires: 1992-12-22
Abstract
Abstract A process for coating a surface with a glass ceramic coating incorporating a catalyst, the process consisting of formulating glass ceramic frit to produce vitrification at low temperatures thereby providing a porous glass ceramic coating to act as a carrier for the catalyst. The catalyst may be one able to bring about oxidation of contamination produced by cooking food.
Inventors
- 👤 Robert Robertson
- 👤 Reginald Arthur Read
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:08
CPC Classifications
C; C03; C03C; C03C4/00; C03C10/00; C03C10/0036; C03C10/0054; C03C8/00; C03C8/02; C03C8/04; C03C8/10; C03C8/12; C23; C23D; C23D3/00; C23D5/00; C23D5/02; C03C2205/00; C03C2205/02; C03C2205/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
158 words
A process for providing a surface with a catalytically-active glass ceramic coating comprising the steps of i. producing a glass ceramic frit having a formulation lying within the ranges SiO 2 30- 70% by weight: Al 2 O 3 0-25% by weight: LiO 2 and/or Na 2 O and/or K 2 O (in total) 0-30% by weight: CaO and/or SrO and/or BaO and/or MgO (in total) 10-40% by weight: ZnO 0-10% by weight: and B 2 O 3 0-20% by weight, ii. milling the frit to a fineness of from 2-20 grams on a 200 mesh sieve (50 ml. sample), iii. preparing a slurry from the frit, iv. incorporating a catalyst in the slurry, v. coating the surface with the slurry and drying the same, and, vi. firing the surface with the dried slurry at a temperature within the range of from 650°-950°C to produce a fully-fired glass ceramic coating with a porosity in excess of about 20%.
Claim 2
Dependent Claim
158 words
A process for providing a surface with a catalytically-active glass ceramic coating comprising the steps of i. producing a glass ceramic frit having a formulation lying within the ranges SiO 2 30- 70% by weight: Al 2 O 3 0-25% by weight: LiO 2 and/or Na 2 O and/or K 2 O (in total) 0-30% by weight: CaO and/or SrO and/or BaO and/or MgO (in total) 10-40% by weight: ZnO 0-10% by weight: and B 2 O 3 0-20% by weight, ii. milling the frit to a fineness of from 2-20 grams on a 200 mesh sieve (50 ml. sample), iii. preparing a slurry from the frit, iv. incorporating a catalyst in the slurry, v. coating the surface with the slurry and drying the same, and, vi. firing the surface with the dried slurry at a temperature within the range of from 650°-950°C to produce a fully-fired glass ceramic coating with a porosity in excess of about 20%.
Claim 3
Dependent Claim
44 words
A process as claimed in claim 1 in which the formulation further includes, in a proportion not exceeding 15% by weight, at least one of the constituents selected from the group consisting of TiO 2 , ZrO 2 and Sb 2 O 3 .
Claim 4
Dependent Claim
24 words
A process as claimed in claim 1 in which the catalyst is suitable for bringing about the oxidation of contamination produced by cooking food.
Claim 5
Dependent Claim
33 words
A process as claimed in claim 1 in which the catalyst comprises an oxide of at least one of the metals selected from the group consisting of iron, nickel, cobalt, manganese and copper.
Claim 6
Dependent Claim
27 words
A process as claimed in claim 1 in which the catalyst is added in a proportion by weight of from 10-40% of the weight of the frit.
Claim 7
Dependent Claim
27 words
A process as claimed in claim 1 in which the catalyst is added in a proportion by weight of from 5-30% of the weight of the frit.
Claim 8
Dependent Claim
58 words
A process as claimed in claim 1 in which the frit is of the formulation SiO 2 49.5% by weight: Al 2 O 3 3.6% by weight: B 2 O 3 8.4% by weight: K 2 O 8.3% by weight: Na 2 O 4.4% by weight: CaO 9.4% by weight: MgO 7.0% by weight: BaO 9.4% by weight.
Claim 9
Dependent Claim
63 words
A process as claimed in claim 1 in which the frit is of the formulation SiO 2 42.0% by weight: Al 2 O 3 6.1% by weight: B 2 O 3 8.4% by weight: K 2 O 8.3% by weight: Na 2 O 4.4% by weight: CaO 9.4% by weight: MgO 7.0% by weight: BaO 9.4% by weight: ZrO 2 5.0% by weight.
Claim 10
Dependent Claim
54 words
A process as claimed in claim 1 in which the frit is of the formulation SiO 2 43.9% by weight: Al 2 O 3 2.8% by weight: B 2 O 3 1.4% by weight: K 2 O 1.1% by weight: CaO 26.0% by weight: Na 2 O 14.9% by weight: ZnO 9.9% by weight.
Claim 11
Dependent Claim
48 words
A process as claimed in claim 1 in which the frit is of the formulation SiO 2 47.8% by weight: Al 2 O 3 8.3% by weight: B 2 O 3 12.7% by weight: K 2 O 7.6% by weight: MgO 6.4% by weight: SrO 17.2% by weight.
Claim 12
Dependent Claim
15 words
A cooker part having a surface produced by the process as claimed in claim 1.
References Cited (Backward Citations)
US2492523A
Cited
US2753271A
Cited
GB1197067A
Cited
US3460523A
Cited
US3547098A
Cited
US3580733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |