US4170956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally-responsive indicating device
Assignee: 3M Co
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Filing: 1978-03-13
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Granted: 1979-10-16
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Expires: 1998-03-13
Abstract
Abstract A thermally-responsive indicating device comprising a housing which defines a cavity therein, an indicating means in said cavity, a biasing means in said cavity, and a class of nitrogen-containing organic locking means in said cavity, wherein said locking means is adapted to fuse at a predetermined temperature.
Inventors
- 👤 Robert L. Wear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:04
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/06; Y; Y10; Y10S; Y10S252/00; Y10S252/962
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
206 words
A thermally-responsive indicating device comprising a housing which defines a cavity closed at one end and open at the other end, an indicating means within said cavity for movement relative to said housing, a biasing means within said cavity for urging the movement of said indicating means relative to said housing, and a fusible locking means within said cavity for resisting movement of said indicating means by said biasing means, wherein said locking means is solid at about 20° C., and is adapted to fuse at a predetermined temperature and wherein said locking means has the formula ##STR39## wherein R 1 is selected from ##STR40## R 2 is selected from saturated aliphatic radicals, aryl radicals and aryl-substituted aliphatic radicals; R 3 is a saturated aliphatic radical containing from about 1 to 20 carbon atoms; and n is 0 or 1; provided that (i) when R 1 is ##STR41## n is 0 and R 2 is a saturated aliphatic radical and (ii) when R 1 is ##STR42## n is 1, R 2 is selected from saturated aliphatic radicals, aromatic radicals and aryl-substituted aliphatic radicals; and provided further that the sum of the number of carbon atoms in R 1 and R 2 is at least about 10.
Claim 2
Dependent Claim
206 words
A thermally-responsive indicating device comprising a housing which defines a cavity closed at one end and open at the other end, an indicating means within said cavity for movement relative to said housing, a biasing means within said cavity for urging the movement of said indicating means relative to said housing, and a fusible locking means within said cavity for resisting movement of said indicating means by said biasing means, wherein said locking means is solid at about 20° C., and is adapted to fuse at a predetermined temperature and wherein said locking means has the formula ##STR39## wherein R 1 is selected from ##STR40## R 2 is selected from saturated aliphatic radicals, aryl radicals and aryl-substituted aliphatic radicals; R 3 is a saturated aliphatic radical containing from about 1 to 20 carbon atoms; and n is 0 or 1; provided that (i) when R 1 is ##STR41## n is 0 and R 2 is a saturated aliphatic radical and (ii) when R 1 is ##STR42## n is 1, R 2 is selected from saturated aliphatic radicals, aromatic radicals and aryl-substituted aliphatic radicals; and provided further that the sum of the number of carbon atoms in R 1 and R 2 is at least about 10.
Claim 3
Dependent Claim
126 words
A thermally-responsive indicating device comprising a housing which defines a cavity closed at one end and open at the other end, an indicating means within said cavity for movement relative to said housing, a biasing means within said cavity for urging the movement of said indicating means relative to said housing, and a fusible locking means within said cavity for resisting movement of said indicating means by said biasing means, wherein said locking means is solid at about 20° C. and is adapted to fuse at a predetermined temperature and has the formula ##STR43## wherein R 4 is a lower alkyl group containing from about 1 to 4 carbon atoms; b is an integer of from about 4 to 20; and d is 0 or 1.
Claim 4
Dependent Claim
126 words
A thermally-responsive indicating device comprising a housing which defines a cavity closed at one end and open at the other end, an indicating means within said cavity for movement relative to said housing, a biasing means within said cavity for urging the movement of said indicating means relative to said housing, and a fusible locking means within said cavity for resisting movement of said indicating means by said biasing means, wherein said locking means is solid at about 20° C. and is adapted to fuse at a predetermined temperature and has the formula ##STR43## wherein R 4 is a lower alkyl group containing from about 1 to 4 carbon atoms; b is an integer of from about 4 to 20; and d is 0 or 1.
Claim 5
Dependent Claim
12 words
A thermally-responsive indicating device according to claim 2 wherein d is 0.
Claim 6
Dependent Claim
16 words
A thermally-responsive indicating device according to claim 3 wherein b is from about 7 to 17.
Claim 7
Dependent Claim
12 words
A thermally-responsive indicating device according to claim 4 wherein b is 13.
Claim 8
Dependent Claim
12 words
A thermally-responsive indicating device according to claim 2 wherein d is 1.
Claim 9
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 6 wherein R 4 is a methyl group.
Claim 10
Dependent Claim
19 words
A thermally-responsive indicating device according to claim 7 wherein said methyl is ortho or para to the amino group.
Claim 11
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 8 wherein b is from 7 to 17.
Claim 12
Dependent Claim
12 words
A thermally-responsive indicating device according to claim 9 wherein b is 8.
Claim 13
Dependent Claim
153 words
A thermally responsive indicating device comprising a housing which defines a cavity closed at one end and open at the other end, an indicating means within said cavity for movement relative to said housing, a biasing means within said cavity for urging the movement of said indicating means relative to said housing, and a fusible locking means within said cavity for resisting movement of said indicating means by said biasing means, wherein said locking means is solid at about 20° C., and is adapted to fuse at a predetermined temperature and has the formula ##STR44## wherein R 3 is a saturated aliphatic radical containing from about 1 to 20 carbon atoms and R 5 is selected from saturated aliphatic radicals and aryl-substituted aliphatic radicals containing from about 1 to 20 carbon atoms, provided that the sum of the number of carbon atoms is R 3 and R 5 is at least about 13.
Claim 14
Dependent Claim
153 words
A thermally responsive indicating device comprising a housing which defines a cavity closed at one end and open at the other end, an indicating means within said cavity for movement relative to said housing, a biasing means within said cavity for urging the movement of said indicating means relative to said housing, and a fusible locking means within said cavity for resisting movement of said indicating means by said biasing means, wherein said locking means is solid at about 20° C., and is adapted to fuse at a predetermined temperature and has the formula ##STR44## wherein R 3 is a saturated aliphatic radical containing from about 1 to 20 carbon atoms and R 5 is selected from saturated aliphatic radicals and aryl-substituted aliphatic radicals containing from about 1 to 20 carbon atoms, provided that the sum of the number of carbon atoms is R 3 and R 5 is at least about 13.
Claim 15
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 11 wherein R 5 contains 12 carbon atoms.
Claim 16
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 12 wherein R 3 contains 15 carbon atoms.
Claim 17
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 12 wherein R 3 contains 17 carbon atoms.
Claim 18
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 11 wherein R 5 contains 8 carbon atoms.
Claim 19
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 15 wherein R 3 contains 17 carbon atoms.
Claim 20
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 11 wherein R 5 contains 18 carbon atoms.
Claim 21
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 17 wherein R 3 contains 9 carbon atoms.
Claim 22
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 17 wherein R 3 contains 11 carbon atoms.
Claim 23
Dependent Claim
109 words
A thermally-responsive indicating device comprising a housing which defines a cavity closed at one end and open at the other end, an indicating means within said cavity for movement relative to said housing, a biasing means within said cavity for urging the movement of said indicating means relative to said housing, and a fusible locking means within said cavity for resisting movement of said indicating means by said biasing means, wherein said locking means is solid at about 20° C., and is adapted to fuse at a predetermined temperature and has the formula ##STR45## wherein R 6 is a saturated aliphatic radical of at least about 6 carbon atoms.
Claim 24
Dependent Claim
109 words
A thermally-responsive indicating device comprising a housing which defines a cavity closed at one end and open at the other end, an indicating means within said cavity for movement relative to said housing, a biasing means within said cavity for urging the movement of said indicating means relative to said housing, and a fusible locking means within said cavity for resisting movement of said indicating means by said biasing means, wherein said locking means is solid at about 20° C., and is adapted to fuse at a predetermined temperature and has the formula ##STR45## wherein R 6 is a saturated aliphatic radical of at least about 6 carbon atoms.
Claim 25
Dependent Claim
15 words
A thermally-responsive indicating device according to claim 20 wherein R 6 contains 18 carbon atoms.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |