US2526638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper treated with formaldehyde and a polymeric polyamine
Assignee: EIDP Inc
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Filing: 1949-03-03
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Granted: 1950-10-24
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Expires: 1969-03-03
Abstract
No abstract record available.
Inventors
- 👤 Martin E Cupery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:04
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
PAPER TREATED WITH FORMALDEHYDE AND A POLYMERIC POLYAMINE IN SOLUTION, SAID POLYMERIC POLYAMINE HAVING A MAIN POLYMER CHAIN CONSISTING SOLELY OF CARBON ATOMS AND CONTAINING A PLURALITY OF AMINO GROUPS AND BEING SELECTED FROM THE CLASS CONSISTING OF POLYMERIC POLYAMINES IN WHICH THE AMINO NITROGEN HAS AT LEAST ONE HYDROGEN ATOM AND IS DIRECTLY ATTACHED BY A SINGLE BOND TO A CARBON ATOM FOR THE MAIN POLYMER CHAIN AND POLYMERIC POLYAMINES CONTAINING PRIMARY AMINO NITROGEN ATOMS LINKED DIRECTLY BY A METHYLENE GROUP TO A CARBON ATOM OF THE MAIN POLYMER CHAIN.
Claim 2
Dependent Claim
91 words
PAPER TREATED WITH FORMALDEHYDE AND A POLYMERIC POLYAMINE IN SOLUTION, SAID POLYMERIC POLYAMINE HAVING A MAIN POLYMER CHAIN CONSISTING SOLELY OF CARBON ATOMS AND CONTAINING A PLURALITY OF AMINO GROUPS AND BEING SELECTED FROM THE CLASS CONSISTING OF POLYMERIC POLYAMINES IN WHICH THE AMINO NITROGEN HAS AT LEAST ONE HYDROGEN ATOM AND IS DIRECTLY ATTACHED BY A SINGLE BOND TO A CARBON ATOM FOR THE MAIN POLYMER CHAIN AND POLYMERIC POLYAMINES CONTAINING PRIMARY AMINO NITROGEN ATOMS LINKED DIRECTLY BY A METHYLENE GROUP TO A CARBON ATOM OF THE MAIN POLYMER CHAIN.
References Cited (Backward Citations)
US2456428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |