US3278667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyurethane sheet elastomers and coated substrates
Assignee: UNIROYAL
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Filing: 1963-04-25
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Granted: 1966-10-11
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Expires: 1983-04-25
Abstract
No abstract record available.
Inventors
- 👤 Roger E Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:04
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; B; B29; B29C; B29C43/00; B29C43/22; C; C08; C08G; C08G18/00; B29L; B29L2007/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN A CONTINUOUS PROCESS FOR PREPARING SOLID ELASTOMERIC POLYURETHANE MATERIALS BY PASSING A SELF-CURVING LIQUID POLYURETHANE PRECURSOR BETWEEN AND IN CONTACT WITH TWO SHEETS MOVING AT THE SAME SPEED AND MAINTAINED AT A PREDETERMINED SEPARATION, AND CONTAINING THE PROCURSOR BETWEEN SAID SHEETS WHILE SAID PRECUSORS CURES TO A TACKFREE POLYURETHANE, THE IMPROVEMENT WHICH COMPRISES INITIALLY PLACING SAID PRECURSOR IN A PLANAR NIP HAVING AN ANGLE NO GREATER THAN ABOUT 15* FORMED BY SAID SHEETS MOVING AT THE SAME SPEED AND CONVERGING TO SAID PREDETERMINED SEPARATION WHILE MAINTAINING A BANK OF SAID PERCURSOR IN SAID NIP OF AT LEAST TWO INCHES AS MEASURED BACK FROM THE FIRST POINT WHERE SAID SHEETS REACH THEIR NARROWEST POINT OF CONVERGENCE, WITH THE PROVISO THAT THE AVERAGE RESIDENCE TIME OF SAID PRECUSOR IN SAID NIP BEING NO GREATER THAN THE WORK TIME OF SAID PRECUSOR.
Claim 2
Dependent Claim
140 words
IN A CONTINUOUS PROCESS FOR PREPARING SOLID ELASTOMERIC POLYURETHANE MATERIALS BY PASSING A SELF-CURVING LIQUID POLYURETHANE PRECURSOR BETWEEN AND IN CONTACT WITH TWO SHEETS MOVING AT THE SAME SPEED AND MAINTAINED AT A PREDETERMINED SEPARATION, AND CONTAINING THE PROCURSOR BETWEEN SAID SHEETS WHILE SAID PRECUSORS CURES TO A TACKFREE POLYURETHANE, THE IMPROVEMENT WHICH COMPRISES INITIALLY PLACING SAID PRECURSOR IN A PLANAR NIP HAVING AN ANGLE NO GREATER THAN ABOUT 15* FORMED BY SAID SHEETS MOVING AT THE SAME SPEED AND CONVERGING TO SAID PREDETERMINED SEPARATION WHILE MAINTAINING A BANK OF SAID PERCURSOR IN SAID NIP OF AT LEAST TWO INCHES AS MEASURED BACK FROM THE FIRST POINT WHERE SAID SHEETS REACH THEIR NARROWEST POINT OF CONVERGENCE, WITH THE PROVISO THAT THE AVERAGE RESIDENCE TIME OF SAID PRECUSOR IN SAID NIP BEING NO GREATER THAN THE WORK TIME OF SAID PRECUSOR.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |