Patent US2644759A successfully refreshed from Google Patents.
US2644759A
Expired / Lapsed
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Printing ink
Assignee: STWB Inc
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Filing: 1951-07-09
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Granted: 1953-07-07
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Expires: 1971-07-09
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:26
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/02; C09D11/03; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A PIGMENT PASTE SUITABLE FOR INCORPORATION INTO A PRINTING INK WHICH COMPRISES A PIGMENT, A PRINTING INK VARNISH, AND A SMALL AMOUNT OF A WETTING AGENT OBTAINED BY HEATING A POLYETHYLENEPOLYAMINE CONTAINING 3-6 NITROGEN ATOMS WITH UREA IN THE RATIO OF 1-4 MOLES OF POLYETHYLENEPOLYAMINE PER MOLE OF UREA.
Claim 2
Dependent Claim
49 words
A PIGMENT PASTE SUITABLE FOR INCORPORATION INTO A PRINTING INK WHICH COMPRISES A PIGMENT, A PRINTING INK VARNISH, AND A SMALL AMOUNT OF A WETTING AGENT OBTAINED BY HEATING A POLYETHYLENEPOLYAMINE CONTAINING 3-6 NITROGEN ATOMS WITH UREA IN THE RATIO OF 1-4 MOLES OF POLYETHYLENEPOLYAMINE PER MOLE OF UREA.
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) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |