Patent US2615863A successfully refreshed from Google Patents.
US2615863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymers
Assignee: Wingfoot Corp
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Filing: 1950-09-29
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Granted: 1952-10-28
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Expires: 1970-09-29
Abstract
No abstract record available.
Inventors
- 👤 Paul J Flory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:22
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A METHOD OF PREPARING A POLYAMIDE CONDENSATION POLYMER WHICH COMPRISES HEATING A COMPOUND OF THE GROUP CONSISTING OF AMINO ACIDS HAVING, AS THE SOLE REACTIVE GROUPS, A SINGLE PRIMARY AMINO GROUP AND A SINGLE CARBOXYLIC ACID GROUP, SAID GROUPS BEING SEPARATED BY MORE THAN FOUR ATOMS, AND THE CORRESPONDING AMIDE-FORMING ESTERS, AMIDES AND LACTAMS OF SAID AMINO ACIDS, WITH A COMPOUND OF THE GROUP CONSISTING OF POLYAMINES HAVING, AS THE SOLE REACTIVE GROUPS, AT LEAST THREE REACTIVE AMINO GROUPS ATTACHED TO ALIPHATIC CARBON ATOMS, AND THE CORRESPONDING AMIDE-FORMING AMIDES OF SAID POLYAMINES, SAID AMINO ACIDS BEING PRESENT IN THE PROPORTION OF 30 TO 30,000 MOLECULES FOR EACH MOLECULE OF POLAMINE.
Claim 2
Independent Claim
110 words
A METHOD OF PREPARING A POLYAMIDE CONDENSATION POLYMER WHICH COMPRISES HEATING A COMPOUND OF THE GROUP CONSISTING OF AMINO ACIDS HAVING, AS THE SOLE REACTIVE GROUPS, A SINGLE PRIMARY AMINO GROUP AND A SINGLE CARBOXYLIC ACID GROUP, SAID GROUPS BEING SEPARATED BY MORE THAN FOUR ATOMS, AND THE CORRESPONDING AMIDE-FORMING ESTERS, AMIDES AND LACTAMS OF SAID AMINO ACIDS, WITH A COMPOUND OF THE GROUP CONSISTING OF POLYAMINES HAVING, AS THE SOLE REACTIVE GROUPS, AT LEAST THREE REACTIVE AMINO GROUPS ATTACHED TO ALIPHATIC CARBON ATOMS, AND THE CORRESPONDING AMIDE-FORMING AMIDES OF SAID POLYAMINES, SAID AMINO ACIDS BEING PRESENT IN THE PROPORTION OF 30 TO 30,000 MOLECULES FOR EACH MOLECULE OF POLAMINE.
References Cited (Backward Citations)
FR906892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |