Patent US2904840A successfully refreshed from Google Patents.
US2904840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for puffing hydrophobic nylon type fibers by swelling the fibers and generating oxygen in situ
Assignee: Feldmuehle AG
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Filing: 1955-08-11
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Granted: 1959-09-22
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Expires: 1975-08-11
Abstract
No abstract record available.
Inventors
- 👤 Hochreuter Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:23
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/184; D06M13/188; D01; D01D; D01D5/00; D01D5/24; D01D5/247; D06M11/00; D06M11/07; D06M11/11; D06M11/26; D06M11/32; D06M11/50; D06M11/51; D06M11/55; D06M11/56; D06M11/58; D06M11/67; D06M13/12; D06M13/127; D06M13/152; Y; Y10; Y10S; Y10S8/00; Y10S8/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A METHOD OF MANUFACTURE OF AERATED SYNTHETIC HYDROPHOBIC POLYAMIDE FIBRES OF POLYHEXAMETHYLENEADIPAMIDE AND POLY 5 AMINOCAPROIC ACID, COMPRISING THE STEPS OF TREATING SAID FIBRES FOR BETWEEN 1 MINUTE TO ABOUT 20 MINUTES WITH AN AQUEOUS SOLUTION CONTAINING A SWELLING AGENT, SAID SWELLING AGENT CONSISTING OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF ACETIC ACID, CHLOROACETIC ACID AND FORMIC ACID, WASHING SAID FIBRES TO REMOVE ANY EXCESS SWELLING AGENT THEREFROM, TREATING SAID FIBRES WITH AN OXYGEN GENERATING CATALYST CONSISTING OF APPROXIMATELY A 1% AQUEOUS SOLUTION OF POTASSIUM PERMANGANATE FOR ABOUT 1 MINUTE UNTIL SAID FIBRES SHOW AN INTENSE VIOLET COLOR, WASHING SAID FIBRES WITH WATER UNTIL THE FIBRES ARE A POLE ROSE COLOR, IMMERSING THE FIBRES IN A SOLUTION OF ABOUT 40% HYDROGEN PEROXIDE FOR ABOUT 5 MINUTES UNTIL SAID HYDROGEN PEROXIDE IS DECOMPOSED UNDER THE INFLUENCE OF SAID CATALYST EVOLVING GAS BUBBLES INFLATING SAID FIBRES WITHOUT BREAKING THE WALLS AND SURFACES OF SAID FIBRES AND THUS CREATING VOIDS IN SAID FIBRES.
Claim 2
Independent Claim
163 words
A METHOD OF MANUFACTURE OF AERATED SYNTHETIC HYDROPHOBIC POLYAMIDE FIBRES OF POLYHEXAMETHYLENEADIPAMIDE AND POLY 5 AMINOCAPROIC ACID, COMPRISING THE STEPS OF TREATING SAID FIBRES FOR BETWEEN 1 MINUTE TO ABOUT 20 MINUTES WITH AN AQUEOUS SOLUTION CONTAINING A SWELLING AGENT, SAID SWELLING AGENT CONSISTING OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF ACETIC ACID, CHLOROACETIC ACID AND FORMIC ACID, WASHING SAID FIBRES TO REMOVE ANY EXCESS SWELLING AGENT THEREFROM, TREATING SAID FIBRES WITH AN OXYGEN GENERATING CATALYST CONSISTING OF APPROXIMATELY A 1% AQUEOUS SOLUTION OF POTASSIUM PERMANGANATE FOR ABOUT 1 MINUTE UNTIL SAID FIBRES SHOW AN INTENSE VIOLET COLOR, WASHING SAID FIBRES WITH WATER UNTIL THE FIBRES ARE A POLE ROSE COLOR, IMMERSING THE FIBRES IN A SOLUTION OF ABOUT 40% HYDROGEN PEROXIDE FOR ABOUT 5 MINUTES UNTIL SAID HYDROGEN PEROXIDE IS DECOMPOSED UNDER THE INFLUENCE OF SAID CATALYST EVOLVING GAS BUBBLES INFLATING SAID FIBRES WITHOUT BREAKING THE WALLS AND SURFACES OF SAID FIBRES AND THUS CREATING VOIDS IN SAID FIBRES.
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) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |