US3844875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforated vinyl film ceiling board
Assignee: Armstrong World Industries Inc
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Filing: 1972-07-18
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Granted: 1974-10-29
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Expires: 1992-07-18
Abstract
Abstract A standard fiber composition ceiling board is provided with an outer laminate of plasticized vinyl film. The holes in the film are smaller than the holes in the fiber composition ceiling board. The product is made by laminating the vinyl film to the ceiling board, then perforating the film and the ceiling board with pin punches. The perforations in the board stay at the size at which they are formed, while the holes in the film shrink in size.
Inventors
- 👤 W Chamberlain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:06
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B32B27/30; B32B3/00; B32B3/26; B32B3/30; B32B38/00; B32B38/04; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; E04B9/00; E04B9/04; E04B9/045; E04B9/0464; B32B38/0012; B32B2038/0028; B32B2307/00; B32B2307/10; B32B2419/00; B32B2419/06; E04B2001/8457; E04B2001/8461; E04B2001/8476; E04B2001/848; E04B2001/8485; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1057; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
AN ACOUSTICAL CEILING PRODUCT COMPRISING A BASE LAYER OF FIBER COMPOSITION CEILING BOARD, LAMINATED THERETO IS A PLASTICIZED VINYL FILM, BOTH STRUCTURES BEING SUBJECTED TO A PERFORATION ACTION AND THEN AGING PERIOD SO THAT THE PERFORATION IN THE CEILING BOARD IS SUBSTANTIALLY LARGER THAN THE PERFORATION IN THE VINYL FILM, SAID VINYL FILM BEING CONCAVE IN THE REGION AROUND THE PERFORATION IN THE VINYL FILM, AND SAID CEILING PRODUCT HAVING AN ACOUSTICAL RATING WHICH IS EQUAL TO THE SIZE OF THE
Claim 2
Dependent Claim
81 words
AN ACOUSTICAL CEILING PRODUCT COMPRISING A BASE LAYER OF FIBER COMPOSITION CEILING BOARD, LAMINATED THERETO IS A PLASTICIZED VINYL FILM, BOTH STRUCTURES BEING SUBJECTED TO A PERFORATION ACTION AND THEN AGING PERIOD SO THAT THE PERFORATION IN THE CEILING BOARD IS SUBSTANTIALLY LARGER THAN THE PERFORATION IN THE VINYL FILM, SAID VINYL FILM BEING CONCAVE IN THE REGION AROUND THE PERFORATION IN THE VINYL FILM, AND SAID CEILING PRODUCT HAVING AN ACOUSTICAL RATING WHICH IS EQUAL TO THE SIZE OF THE
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |