Patent US4128685A successfully refreshed from Google Patents.
US4128685A
Expired / Lapsed
US
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Skivable billet and products
Assignee: 3M Co
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Filing: 1976-12-06
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Granted: 1978-12-05
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Expires: 1996-12-06
Abstract
Abstract A skivable billet having improved uniform heat absorptive ability in which layers of enhanced optical density comprise water soluble polyazo direct dyes such as Formanil Black G and finely divided silica.
Inventors
- 👤 Robert D. Lowrey
- 👤 Arthur A. Wegwerth
- 👤 Donna M. Koeck
- 👤 Sanford Cobb, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:56
CPC Classifications
B; B32; B32B; B32B23/00; B32B23/04; B32B23/08; B26; B26D; B26D3/00; B26D3/006; B26D3/008; B32B2264/00; B32B2264/10; B32B2264/102; B32B2307/00; B32B2307/40; B32B2307/50; B32B2307/56; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/25; Y10T428/259; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31891; Y10T428/31935
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
A skivable billet of alternating layers of low and relatively high optical density, said layers being relatively similar in absorptive properties toward infrared radiation, said layers of low optical density being essentially cellulose acetate butyrate and said layers of relatively higher optical density being a composition comprised of composite self-cross-linking anionic acrylates, finely divided silica and water soluble polyazo direct dye.
Claim 2
Dependent Claim
61 words
A skivable billet of alternating layers of low and relatively high optical density, said layers being relatively similar in absorptive properties toward infrared radiation, said layers of low optical density being essentially cellulose acetate butyrate and said layers of relatively higher optical density being a composition comprised of composite self-cross-linking anionic acrylates, finely divided silica and water soluble polyazo direct dye.
Claim 3
Dependent Claim
18 words
A skivable billet according to claim 1 wherein the water soluble polyazo direct dye is Formanil Black G.
Claim 4
Dependent Claim
21 words
A skived film about 0.15 to 0.25 mm thick formed by skiving a billet according to claim 1 with surface heating.
References Cited (Backward Citations)
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Cited
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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) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |