Patent US4709987A successfully refreshed from Google Patents.
US4709987A
Expired / Lapsed
US
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Pressure and temperature insensitive glass and optical coatings and fibers therefrom
Assignee: United States Department of the Navy
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Filing: 1985-12-10
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Granted: 1987-12-01
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Expires: 2005-12-10
Abstract
Abstract Pressure and temperature insensitive optical fibers are produced using a Ta2O5 based glass composition which has a high bulk modulus and a low thermal expansion coefficient. The glass composition can function as the cladding in the optical fiber or as a protective coating which surrounds the cladding thereby protecting the fiber from fluctuations in temperature and pressure.
Inventors
- 👤 Douglas Blackburn
- 👤 Albert Feldman
- 👤 Nicholas Lagakos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:44
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/4436; C; C03; C03C; C03C13/00; C03C13/04; C03C13/045; C03C13/046; G02B6/443
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
100 words
A glass composition suitable for use as a temperature and pressure insensitive protective layer for optical fibers, comprising: up to about 30 weight percent CaO; between about 15-25 weight percent Al 2 O 3 ; between about 5-15 weight percent MgO; up to about 15 weight percent TiO 2 ; up to about 10 weight percent ZrO 2 ; between about 20-35 weight percent SiO 2 ; up to about 10 weight percent B 2 O 3 ; between about 5-45 weight percent Ta 2 O 5 ; and up to about 40 weight percent Nb 2 O 5 .
Claim 2
Dependent Claim
100 words
A glass composition suitable for use as a temperature and pressure insensitive protective layer for optical fibers, comprising: up to about 30 weight percent CaO; between about 15-25 weight percent Al 2 O 3 ; between about 5-15 weight percent MgO; up to about 15 weight percent TiO 2 ; up to about 10 weight percent ZrO 2 ; between about 20-35 weight percent SiO 2 ; up to about 10 weight percent B 2 O 3 ; between about 5-45 weight percent Ta 2 O 5 ; and up to about 40 weight percent Nb 2 O 5 .
Claim 3
Dependent Claim
38 words
The glass composition of claim 1, comprising; about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 25 weight percent SiO 2 ; and about 45 weight percent Ta 2 O 5 .
Claim 4
Dependent Claim
50 words
The glass composition of claim 1, comprising; about 5 weight percent CaO; about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 10 weight percent TiO 2 ; about 25 weight percent SiO 2 ; and about 30 weight percent Ta 2 O 5 .
Claim 5
Dependent Claim
47 words
The glass composition of claim 1, comprising; about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 30 weight percent SiO 2 ; about 35 weight percent Ta 2 O 5 ; and about 5 weight percent B 2 O 3 .
Claim 6
Dependent Claim
45 words
The glass composition of claim 1, comprising; about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 5 weight percent TiO 2 ; about 35 weight percent SiO 2 : and about 30 weight percent Ta 2 O 5 .
Claim 7
Dependent Claim
107 words
An optical fiber, comprising: a solid cylindrical light-propagating core; a cladding concentrically surrounding said core; and a glass protective layer concentrically surrounding said cladding comprising up to about 30 weight percent CaO; between about 15-25 weight percent Al 2 O 3 ; between about 5-15 weight percent MgO; up to about 15 weight percent TiO 2 ; up to about 10 weight percent ZrO 2 ; between about 20-35 weight percent SiO 2 ; up to about 10 weight percent B 2 O 3 ; between about 5-45 weight percent Ta 2 O 5 ; and up to about 40 weight percent Nb 2 O 5 .
Claim 8
Dependent Claim
107 words
An optical fiber, comprising: a solid cylindrical light-propagating core; a cladding concentrically surrounding said core; and a glass protective layer concentrically surrounding said cladding comprising up to about 30 weight percent CaO; between about 15-25 weight percent Al 2 O 3 ; between about 5-15 weight percent MgO; up to about 15 weight percent TiO 2 ; up to about 10 weight percent ZrO 2 ; between about 20-35 weight percent SiO 2 ; up to about 10 weight percent B 2 O 3 ; between about 5-45 weight percent Ta 2 O 5 ; and up to about 40 weight percent Nb 2 O 5 .
Claim 9
Dependent Claim
18 words
The optical fiber of claim 6 having one or more substrate layers concentrically surrounding said glass protective layer.
Claim 10
Dependent Claim
16 words
The optical fiber of claim 6 having one or more substrate layers concentrically surrounding said cladding.
Claim 11
Dependent Claim
42 words
The optical fiber of claim 6 wherein said glass composition comprises: about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 25 weight percent SiO 2 ; and about 45 weight percent Ta 2 O 5 .
Claim 12
Dependent Claim
54 words
The optical fiber of claim 6 wherein said glass composition comprises: about 5 weight percent CaO; about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 10 weight percent TiO 2 ; about 25 weight percent SiO 2 ; and about 30 weight percent Ta 2 O 5 .
Claim 13
Dependent Claim
51 words
The optical fiber of claim 6 wherein said glass composition comprises: about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 30 weight percent SiO 2 ; about 35 weight percent Ta 2 O 5 ; and about 5 weight percent B 2 O 3 .
Claim 14
Dependent Claim
49 words
The optical fiber of claim 6 wherein said glass composition comprises: about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 5 weight percent TiO 2 ; about 35 weight percent SiO 2 ; and about 30 weight percent Ta 2 O 5 .
Claim 15
Dependent Claim
100 words
An optical fiber, comprising: a solid cylindrical light-propagating core; a cladding concentrically surrounding said core, said cladding comprising up to about 30 weight percent CaO; between about 15-25 weight percent Al 2 O 3 ; between about 5-15 weight percent MgO; up to about 15 weight percent TiO 2 ; up to about 10 weight percent ZrO 2 ; between about 20-35 weight percent SiO 2 ; up to about 10 weight percent B 2 O 3 ; between about 5-45 weight percent Ta 2 O 5 ; and up to about 40 weight percent Nb 2 O 5 .
Claim 16
Dependent Claim
100 words
An optical fiber, comprising: a solid cylindrical light-propagating core; a cladding concentrically surrounding said core, said cladding comprising up to about 30 weight percent CaO; between about 15-25 weight percent Al 2 O 3 ; between about 5-15 weight percent MgO; up to about 15 weight percent TiO 2 ; up to about 10 weight percent ZrO 2 ; between about 20-35 weight percent SiO 2 ; up to about 10 weight percent B 2 O 3 ; between about 5-45 weight percent Ta 2 O 5 ; and up to about 40 weight percent Nb 2 O 5 .
Claim 17
Dependent Claim
16 words
The optical fiber of claim 13 having one or more substrate layers concentrically surrounding said cladding.
Claim 18
Dependent Claim
42 words
The optical fiber of claim 13 wherein said glass composition comprises: about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 25 weight percent SiO 2 ; and about 45 weight percent Ta 2 O 5 .
Claim 19
Dependent Claim
54 words
The optical fiber of claim 13 wherein said glass composition comprises: about 5 weight percent CaO; about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 10 weight percent TiO 2 ; about 25 weight percent SiO 2 ; and about 30 weight percent Ta 2 O 5 .
Claim 20
Dependent Claim
51 words
The optical fiber of claim 13 wherein said glass composition comprises: about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 30 weight percent SiO 2 ; about 35 weight percent Ta 2 O 5 ; and about 5 weight percent B 2 O 3 .
Claim 21
Dependent Claim
49 words
The optical fiber of claim 13 wherein said glass composition comprises: about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 5 weight percent TiO 2 ; about 35 weight percent SiO 2 ; and about 30 weight percent Ta 2 O 5 .
Claim 22
Dependent Claim
102 words
A glass composition suitable for use as a temperature and pressure insensitive protective layer for optical fibers, consisting essentially of: up to about 30 weight percent CaO; between about 15-25 weight percnet Al 2 O 3 ; between about 5-15 weight percent MgO; up to about 15 weight percent TiO 2 ; up to about 10 weight percent ZrO 2 ; between about 20-35 weight percent SiO 2 ; up to about 10 weight percent B 2 O 3 ; between about 5-45 weight percent Ta 2 O 5 ; and up to about 40 weight percent Nb 2 O 5 .
Claim 23
Dependent Claim
102 words
A glass composition suitable for use as a temperature and pressure insensitive protective layer for optical fibers, consisting essentially of: up to about 30 weight percent CaO; between about 15-25 weight percnet Al 2 O 3 ; between about 5-15 weight percent MgO; up to about 15 weight percent TiO 2 ; up to about 10 weight percent ZrO 2 ; between about 20-35 weight percent SiO 2 ; up to about 10 weight percent B 2 O 3 ; between about 5-45 weight percent Ta 2 O 5 ; and up to about 40 weight percent Nb 2 O 5 .
Claim 24
Dependent Claim
40 words
The glass composition of claim 19, consisting essentially of: about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 25 weight percent SiO 2 ; and about 45 weight percent Ta 2 O 5 .
Claim 25
Dependent Claim
52 words
The glass composition of claim 19, consisting essentially of: about 5 weight percent CaO; about 20 weight percent Al 2 O 3 : about 10 weight percent MgO: about 10 weight percent TiO 2 ; about 25 weight percent SiO 2 ; and about 30 weight percent Ta 2 O 5 .
Claim 26
Dependent Claim
49 words
The glass composition of claim 19, consisting essentially of: about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 30 weight percent SiO 2 ; about 35 weight percent Ta 2 O 5 ; and about 5 weight persent B 2 O 3 .
Claim 27
Dependent Claim
47 words
The glass composition of claim 19, consisting essentially of: about 20 weight percent Al 2 O 3 ; about 10 weight percent MgO; about 5 weight percent TiO 2 ; about 35 weight percent SiO 2 ; and about 30 weight persent Ta 2 O 5 .
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) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |