US3632379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive copy sheet
Assignee: 3M Co
•
Filing: 1969-10-30
•
Granted: 1972-01-04
•
Expires: 1989-10-30
Abstract
Abstract The reaction temperature of a copy-sheet containing bis(triphenylphosphine)borohydridocopper(I) as heat-decomposable image-forming component is significantly reduced by incorporating certain nonfugitive nitrogen bases or heat-decomposable progenitors of nitrogen bases.
Inventors
- 👤 Joseph A Wiese Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:58
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/32; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
13 words
The article of claim 1 wherein said coating includes a polymeric film-forming binder.
Claim 2
Dependent Claim
27 words
The article of claim 2 in the form of a heat-sensitive copy sheet comprising a thin flexible backing with said coating extending over one entire major surface.
Claim 3
Dependent Claim
24 words
The copy sheet of claim 3 wherein the copper compoUnd is present in an amount of at least about 1 gram per square meter.
Claim 4
Dependent Claim
11 words
The copy sheet of claim 4 wherein the backing is paper.
Claim 5
Dependent Claim
14 words
The copy sheet of claim 4 wherein the backing is a transparent plastic film.
Claim 6
Dependent Claim
15 words
The copy sheet of claim 4 wherein the heat-sensitive layer contains an alkyl ammonium cyanoacetate.
Claim 7
Dependent Claim
12 words
The copy sheet of claim 7 wherein the heat-sensitive layer contains tetramethylguanidine.
Claim 8
Dependent Claim
12 words
The copy sheet of claim 7 wherein the heat-sensitive layer contains bipyridine.
Claim 9
Dependent Claim
16 words
The copy sheet of claim 7 wherein the heat-sensitive layer contains a nickel chloride-phenyl hydrazine complex.
References Cited (Backward Citations)
US2813042A
Cited
US3505093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |