Patent US3921273A successfully refreshed from Google Patents.
US3921273A
Expired / Lapsed
US
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Method of filling a casing with heat insulating fibers
Assignee: Toyota Motor Corp
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Filing: 1974-10-07
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Granted: 1975-11-25
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Expires: 1994-10-07
Abstract
Abstract Method of filling a casing with heat insulating fibers in which a fibrous heat insulating mass of fixed size is inserted into a space to be filled by vacuum-packing the fibrous mass in a vacuum-resistant bag, which may then be wrapped about an inner cylinder, introducing the bag into an outer cylinder and, after breaking the vacuum seal, allowing the fibrous mass to swell and fill any space within the outer cylinder not occupied by said inner cylinder, if any.
Inventors
- 👤 Katsumi Kondo
- 👤 Fumiyoshi Noda
- 👤 Mikio Murachi
- 👤 Yuji Watanabe
- 👤 Masaru Usui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:23
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/18; B29C44/182; B29C44/184; B29C44/185; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B29C44/34; B29C44/3492; B29C44/3496; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/26; F16; F16L; F16L59/00; F16L59/02; F16L59/028; F16L59/14; F16L59/16; F01N2310/00; F01N2310/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49345; Y10T29/49394; Y10T29/49398; Y10T29/4981; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49872; Y10T29/49876; Y10T29/49879; Y10T29/53; Y10T29/53657
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
Method of manufacturing a heat insulator which comprises the steps of introducing between an outer casing and an inner casing an insert comprising a mass of fibrous material which has been compressed by vacuum-packing it in a hermetically sealed bag, and then unsealing said bag to permit said material to expand within said casing.
Claim 2
Dependent Claim
54 words
Method of manufacturing a heat insulator which comprises the steps of introducing between an outer casing and an inner casing an insert comprising a mass of fibrous material which has been compressed by vacuum-packing it in a hermetically sealed bag, and then unsealing said bag to permit said material to expand within said casing.
Claim 3
Dependent Claim
35 words
Method as claimed in claim 1 which comprises the step of first wrapping said sealed bag containing said mass of fibrous material about an inner casing to form the insert introduced into said outer casing.
Claim 4
Dependent Claim
59 words
Method as claimed in claim 1 in which said bag is sealed in such a way that it may be unsealed by the application of an amount of heat insufficient to damage said fibrous mass and casing, and comprising the step of applying said amount of heat to said insulator after said bag has been introduced into said casing.
Claim 5
Dependent Claim
57 words
Method as claimed in claim 1 in which said bag is made of a material which is destroyed by the application thereto of an amount of heat insufficient to damage said casing and fibrous mass, and comprising the step of applying said amount of heat to said insulator after said bag has been introduced into said casing.
Claim 6
Dependent Claim
27 words
Method as claimed in claim 1 in which said fibrous material is selected from the group consisting of rock wool, silica fiber, ceramic fiber, and mixtures thereof.
Claim 7
Dependent Claim
27 words
Method as claimed in claim 1 in which said bag is made from a plastic selected from the group consisting of nylon, polyethylene, polypropylene, and combinations thereof.
Claim 8
Dependent Claim
34 words
Method as claimed in claim 1 in which the fibrous mass is caused to fill the space between inner and outer cylindrical casing encircling a passage for the gas exhausted from an automotive engine.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |