Patent US3224898A successfully refreshed from Google Patents.
US3224898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Release-coated carrier webs and method of using same
Assignee: Warren SD Co
•
Filing: 1962-04-11
•
Granted: 1965-12-21
•
Expires: 1982-04-11
Abstract
No abstract record available.
Inventors
- 👤 Millard C Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:11
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/68; B29C33/60; B29C41/00; B29C41/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
116 words
PROCESS OF MAKING AN AIR-PERMEABLE PLASTIC FILM WHICH COMPRISES SPREADING A LAYER OF A PLASTISOL CONTAINING POWDERED RESIN DISPERSED IN A PLASTICIZER UPON THE SURFACE OF A CARRIER WEB COATED WITH A RELEASE COATING TO WHICH A PLASTIC FILM ADHERES ONLY WEALKY, SAID COATING CONTAINING A BLOWING AGENT CAPABLE OF SUDDENLY RELEASING GAS UPON BEING HEATED TO A CRITICAL TEMPERATURE, HEATING SAID COATED WEB CARRYING SAID LAYER OF PLASTISOL ABOVE SAID CRITICAL TEMPERATURE WHEREBY GAS IS RELEASED WHICH PENETRATES SAID LAYER OF PLASTISOL AND FORMS MINUTE HOLES THEREIN, FURTHER HEATING SAID LAYER OF PLASTISOL TO CONSOLIDATE THE SAME INTO A TOUGH FILM WITHOUT CLOSING SAID HOLES, AND THEREAFTER REMOVING THE SAID FILM FROM SAID CARRIER WEB.
References Cited (Backward Citations)
US2866717A
Cited
US2894855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |